Your body is basically a massive transport network that needs...
Biology460 views·Updated 19 Jun 2026·5 pagesExchange and Transport Systems in Animals | Edexcel GCSE Biology
gmelonergan@gmelonergan_pquc
1 / 5
1
of 5
Efficient Transport and Exchange
Think about why small animals like mice can survive without complex transport systems, but you can't. It's all about the surface area to volume ratio - the bigger this ratio, the easier it is for substances to get in and out of cells.
Your gas exchange system is perfectly designed for efficiency. In your lungs, oxygen-poor blood meets oxygen-rich air in tiny sacs called alveoli. These have incredibly thin walls (just one cell thick) and massive surface area, making gas exchange lightning fast.
Fick's law shows exactly what makes diffusion work: rate of diffusion ∝ (surface area × concentration difference) / membrane thickness. Basically, bigger surface area and steeper concentration gradients speed things up, whilst thicker membranes slow things down.
Key Point: Your alveoli have about 70 square metres of surface area - that's roughly the size of a tennis court crammed into your chest!
2
of 5
The Circulatory System
Your blood vessels are like a three-tier motorway system. Arteries are the motorways - thick, muscular walls handle high pressure as they carry oxygenated blood away from your heart. Capillaries are tiny side streets with walls just one cell thick, perfect for quick substance exchange. Veins are the slow lanes back home, carrying deoxygenated blood with low pressure (that's why they need valves to prevent backflow).
Your blood is basically a liquid transport service. Plasma (55%) is the delivery truck - a straw-coloured liquid carrying everything else. Red blood cells (41%) are oxygen taxis with no nucleus (more room for haemoglobin) and a biconcave shape for maximum surface area.
White blood cells (3%) are your security team. Phagocytes literally eat foreign invaders, whilst lymphocytes produce antibodies that tag enemies for destruction. Platelets (<1%) are your emergency repair crew - they clot blood when you're injured by forming an insoluble mesh that traps blood cells.
Key Point: A single drop of blood contains about 5 million red blood cells - that's more people than live in most countries!
3
of 5
The Heart
Your heart is essentially two pumps stuck together, creating a double circulatory system. The right side handles deoxygenated blood (vena cava → right atrium → right ventricle → pulmonary artery to lungs), whilst the left side deals with oxygenated blood (pulmonary vein → left atrium → left ventricle → aorta to body).
The left ventricle has much thicker muscle walls because it needs to pump blood all around your body, not just to your nearby lungs. Heart valves act like one-way doors, preventing blood from flowing backwards.
Your heart has its own built-in pacemaker cells that naturally control heart rate. You can calculate how much blood your heart pumps using: cardiac output = stroke volume × heart rate. During exercise, both stroke volume and heart rate increase to deliver more oxygen to your muscles.
Key Point: Your heart beats roughly 100,000 times per day, pumping about 7,500 litres of blood - that's enough to fill a small swimming pool!
4
of 5
Heart Disease and Treatments
Coronary heart disease happens when fatty deposits build up in the arteries supplying your heart muscle. This narrows the arteries, reducing blood flow and oxygen delivery - basically giving your heart a constant traffic jam.
Doctors have several treatment options. Statins are daily pills that reduce cholesterol, slowing down fatty build-up (though they can cause muscle aches). Stents are tiny tubes inserted to keep arteries open - great for improving blood flow but can cause dangerous blood clots.
For severe cases, heart transplants replace the entire damaged heart. They're incredibly durable but expensive, with risks of rejection and clotting. Heart valve replacements come in two types: mechanical valves last longer but increase clotting risk, whilst biological valves from animals are safer but don't last as long.
Key Point: Heart disease is the leading cause of death globally, but most cases are preventable through healthy lifestyle choices you can make right now!
5
of 5
Cellular Respiration
Cellular respiration is how your cells extract energy from glucose - think of it as your cellular power stations working 24/7. Aerobic respiration happens in your mitochondria and needs oxygen: glucose + oxygen → carbon dioxide + water. This process is exothermic, meaning it releases energy.
During exercise, your body works overtime. Your heart beats faster to pump more oxygenated blood to muscles, and you breathe faster to get more oxygen into your bloodstream. Your muscle cells gobble up glucose and oxygen at an incredible rate.
When exercise gets really intense, oxygen runs out faster than you can replace it. Your cells switch to anaerobic respiration in the cytoplasm, which doesn't need oxygen but produces lactic acid: glucose → lactic acid. That burning feeling in your muscles during intense exercise? That's lactic acid building up.
Key Point: Your body can switch between aerobic and anaerobic respiration instantly - it's like having both electric and petrol engines in a hybrid car!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
BiologyMost popular content: Heart
9BiologyHuman Heart Circulation
Explore the structure and function of the human heart in this detailed overview. Understand the double circulatory system, the flow of oxygenated and deoxygenated blood, and the significance of heart valves and chambers. Ideal for GCSE AQA Biology students, this summary covers key concepts essential for mastering heart physiology.
99,156975
BiologyGCSE Biology Revision Essentials
Comprehensive summary of key concepts in GCSE Biology, covering cell structures, respiration, transport systems, digestion, and the immune response. Ideal for AQA GCSE students preparing for Paper 1. Enhance your understanding of enzymes, photosynthesis, and the circulatory system with this concise guide.
915,4273,080
BiologyHeart Structure & Function
Explore the anatomy and physiology of the heart, including the roles of the pulmonary artery, aorta, vena cava, and pulmonary veins. Understand how blood circulates through the heart's chambers and the significance of coronary arteries. This summary is essential for GCSE biology students studying the circulatory system.
104,85678
BiologyHuman Biology Essentials
Explore key concepts in human biology, including blood sugar regulation, reproductive systems, cardiovascular health, and genetic disorders. This comprehensive summary covers essential topics such as thrombosis, hormonal control, and infertility treatments, providing a solid foundation for understanding human physiology and anatomy. Ideal for students preparing for exams or seeking to deepen their knowledge in higher human biology.
S55599
BiologyB1.2 Organisation
content for Organisation gcse biology combined
93234
BiologyUnderstanding the Cardiac Cycle
Explore the phases of the cardiac cycle, including systole and diastole, and their roles in blood circulation. This summary covers heart functions, pressure changes, and cardiac output calculations, essential for A Level biology students. Gain insights into how the heart pumps blood effectively and the significance of atrial and ventricular contractions.
125326
BiologyAnimal Transport Systems
Explore the key concepts of transport in animals, including blood flow, heart structure, and the role of haemoglobin in oxygen dissociation. This comprehensive summary covers the cardiac cycle, blood vessels, and the circulatory system, providing essential insights for OCR A Biology Module 3.1.2.
1256119
BiologyMammalian Heart Anatomy
Explore the detailed anatomy and functions of the mammalian heart, including blood circulation pathways, heart chambers, valves, and the role of the sino-atrial node. This comprehensive overview is essential for A-level Biology students studying the cardiovascular system.
122,21694
BiologyBiology Paper 2 Overview
This comprehensive summary covers key topics for Biology Paper 2, including homeostasis, inheritance, ecology, cellular processes, disease prevention, and the roles of enzymes. Ideal for GCSE revision, this resource highlights essential concepts such as photosynthesis, the immune system, and the circulatory system, ensuring a solid understanding of biological principles.
101,06723
Most popular content in Biology
9C
BiologyCell Biology and Cell structure
cell structures
93,2520
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3534
BiologyAQA Biology: Key Concepts
Explore essential AQA Biology topics including Photosynthesis, Respiration, Homeostasis, Genetics, and Ecology. This comprehensive knowledge organizer covers key concepts such as energy transfer, hormonal control, and genetic variation, providing a solid foundation for your studies. Ideal for exam preparation and understanding biological processes.
108,794306
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8055
BiologyA-Level Biology Year 1 Overview
Comprehensive summary of AQA A-Level Biology Year 1, covering key topics such as cellular structure, protein synthesis, immune response, gas exchange, and more. Ideal for exam preparation and understanding biological concepts. Includes detailed insights into cellular processes, biological classification, and the circulatory system.
1214,894694
T
BiologyTypes of cells
biology
101,2090
B
BiologyBiology Paper 1 quiz
this is a simple quiz on key knowledge needed for paper 1
102,7765
BiologyBiology paper 1 Summary
Notes for Biology paper 1 contains the full course for AQA higher combined!
104,132106
C
BiologyCells part 1 function of cells.
About cells and function of cells etc.
119861
Most popular content
9
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8803,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,6782,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8731,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6571,399
C
BiologyCell Biology and Cell structure
cell structures
93,2520
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,434907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,155125
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,761210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,711198
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user
Biology460 views·Updated 19 Jun 2026·5 pagesExchange and Transport Systems in Animals | Edexcel GCSE Biology
gmelonergan@gmelonergan_pquc
Your body is basically a massive transport network that needs to move oxygen, nutrients, and waste products around constantly. Understanding how your circulatory system, heart, and cellular respiration work together will help you ace your biology exams whilst appreciating the...
1
of 5
Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Efficient Transport and Exchange
Think about why small animals like mice can survive without complex transport systems, but you can't. It's all about the surface area to volume ratio - the bigger this ratio, the easier it is for substances to get in and out of cells.
Your gas exchange system is perfectly designed for efficiency. In your lungs, oxygen-poor blood meets oxygen-rich air in tiny sacs called alveoli. These have incredibly thin walls (just one cell thick) and massive surface area, making gas exchange lightning fast.
Fick's law shows exactly what makes diffusion work: rate of diffusion ∝ (surface area × concentration difference) / membrane thickness. Basically, bigger surface area and steeper concentration gradients speed things up, whilst thicker membranes slow things down.
Key Point: Your alveoli have about 70 square metres of surface area - that's roughly the size of a tennis court crammed into your chest!
2
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The Circulatory System
Your blood vessels are like a three-tier motorway system. Arteries are the motorways - thick, muscular walls handle high pressure as they carry oxygenated blood away from your heart. Capillaries are tiny side streets with walls just one cell thick, perfect for quick substance exchange. Veins are the slow lanes back home, carrying deoxygenated blood with low pressure (that's why they need valves to prevent backflow).
Your blood is basically a liquid transport service. Plasma (55%) is the delivery truck - a straw-coloured liquid carrying everything else. Red blood cells (41%) are oxygen taxis with no nucleus (more room for haemoglobin) and a biconcave shape for maximum surface area.
White blood cells (3%) are your security team. Phagocytes literally eat foreign invaders, whilst lymphocytes produce antibodies that tag enemies for destruction. Platelets (<1%) are your emergency repair crew - they clot blood when you're injured by forming an insoluble mesh that traps blood cells.
Key Point: A single drop of blood contains about 5 million red blood cells - that's more people than live in most countries!
3
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The Heart
Your heart is essentially two pumps stuck together, creating a double circulatory system. The right side handles deoxygenated blood (vena cava → right atrium → right ventricle → pulmonary artery to lungs), whilst the left side deals with oxygenated blood (pulmonary vein → left atrium → left ventricle → aorta to body).
The left ventricle has much thicker muscle walls because it needs to pump blood all around your body, not just to your nearby lungs. Heart valves act like one-way doors, preventing blood from flowing backwards.
Your heart has its own built-in pacemaker cells that naturally control heart rate. You can calculate how much blood your heart pumps using: cardiac output = stroke volume × heart rate. During exercise, both stroke volume and heart rate increase to deliver more oxygen to your muscles.
Key Point: Your heart beats roughly 100,000 times per day, pumping about 7,500 litres of blood - that's enough to fill a small swimming pool!
4
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Heart Disease and Treatments
Coronary heart disease happens when fatty deposits build up in the arteries supplying your heart muscle. This narrows the arteries, reducing blood flow and oxygen delivery - basically giving your heart a constant traffic jam.
Doctors have several treatment options. Statins are daily pills that reduce cholesterol, slowing down fatty build-up (though they can cause muscle aches). Stents are tiny tubes inserted to keep arteries open - great for improving blood flow but can cause dangerous blood clots.
For severe cases, heart transplants replace the entire damaged heart. They're incredibly durable but expensive, with risks of rejection and clotting. Heart valve replacements come in two types: mechanical valves last longer but increase clotting risk, whilst biological valves from animals are safer but don't last as long.
Key Point: Heart disease is the leading cause of death globally, but most cases are preventable through healthy lifestyle choices you can make right now!
5
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Cellular Respiration
Cellular respiration is how your cells extract energy from glucose - think of it as your cellular power stations working 24/7. Aerobic respiration happens in your mitochondria and needs oxygen: glucose + oxygen → carbon dioxide + water. This process is exothermic, meaning it releases energy.
During exercise, your body works overtime. Your heart beats faster to pump more oxygenated blood to muscles, and you breathe faster to get more oxygen into your bloodstream. Your muscle cells gobble up glucose and oxygen at an incredible rate.
When exercise gets really intense, oxygen runs out faster than you can replace it. Your cells switch to anaerobic respiration in the cytoplasm, which doesn't need oxygen but produces lactic acid: glucose → lactic acid. That burning feeling in your muscles during intense exercise? That's lactic acid building up.
Key Point: Your body can switch between aerobic and anaerobic respiration instantly - it's like having both electric and petrol engines in a hybrid car!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Heart
9BiologyHuman Heart Circulation
Explore the structure and function of the human heart in this detailed overview. Understand the double circulatory system, the flow of oxygenated and deoxygenated blood, and the significance of heart valves and chambers. Ideal for GCSE AQA Biology students, this summary covers key concepts essential for mastering heart physiology.
99,156975
BiologyGCSE Biology Revision Essentials
Comprehensive summary of key concepts in GCSE Biology, covering cell structures, respiration, transport systems, digestion, and the immune response. Ideal for AQA GCSE students preparing for Paper 1. Enhance your understanding of enzymes, photosynthesis, and the circulatory system with this concise guide.
915,4273,080
BiologyHeart Structure & Function
Explore the anatomy and physiology of the heart, including the roles of the pulmonary artery, aorta, vena cava, and pulmonary veins. Understand how blood circulates through the heart's chambers and the significance of coronary arteries. This summary is essential for GCSE biology students studying the circulatory system.
104,85678
BiologyHuman Biology Essentials
Explore key concepts in human biology, including blood sugar regulation, reproductive systems, cardiovascular health, and genetic disorders. This comprehensive summary covers essential topics such as thrombosis, hormonal control, and infertility treatments, providing a solid foundation for understanding human physiology and anatomy. Ideal for students preparing for exams or seeking to deepen their knowledge in higher human biology.
S55599
BiologyB1.2 Organisation
content for Organisation gcse biology combined
93234
BiologyUnderstanding the Cardiac Cycle
Explore the phases of the cardiac cycle, including systole and diastole, and their roles in blood circulation. This summary covers heart functions, pressure changes, and cardiac output calculations, essential for A Level biology students. Gain insights into how the heart pumps blood effectively and the significance of atrial and ventricular contractions.
125326
BiologyAnimal Transport Systems
Explore the key concepts of transport in animals, including blood flow, heart structure, and the role of haemoglobin in oxygen dissociation. This comprehensive summary covers the cardiac cycle, blood vessels, and the circulatory system, providing essential insights for OCR A Biology Module 3.1.2.
1256119
BiologyMammalian Heart Anatomy
Explore the detailed anatomy and functions of the mammalian heart, including blood circulation pathways, heart chambers, valves, and the role of the sino-atrial node. This comprehensive overview is essential for A-level Biology students studying the cardiovascular system.
122,21694
BiologyBiology Paper 2 Overview
This comprehensive summary covers key topics for Biology Paper 2, including homeostasis, inheritance, ecology, cellular processes, disease prevention, and the roles of enzymes. Ideal for GCSE revision, this resource highlights essential concepts such as photosynthesis, the immune system, and the circulatory system, ensuring a solid understanding of biological principles.
101,06723
Most popular content in Biology
9C
BiologyCell Biology and Cell structure
cell structures
93,2520
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3534
BiologyAQA Biology: Key Concepts
Explore essential AQA Biology topics including Photosynthesis, Respiration, Homeostasis, Genetics, and Ecology. This comprehensive knowledge organizer covers key concepts such as energy transfer, hormonal control, and genetic variation, providing a solid foundation for your studies. Ideal for exam preparation and understanding biological processes.
108,794306
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8055
BiologyA-Level Biology Year 1 Overview
Comprehensive summary of AQA A-Level Biology Year 1, covering key topics such as cellular structure, protein synthesis, immune response, gas exchange, and more. Ideal for exam preparation and understanding biological concepts. Includes detailed insights into cellular processes, biological classification, and the circulatory system.
1214,894694
T
BiologyTypes of cells
biology
101,2090
B
BiologyBiology Paper 1 quiz
this is a simple quiz on key knowledge needed for paper 1
102,7765
BiologyBiology paper 1 Summary
Notes for Biology paper 1 contains the full course for AQA higher combined!
104,132106
C
BiologyCells part 1 function of cells.
About cells and function of cells etc.
119861
Most popular content
9SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8803,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,6782,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8731,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6571,399
C
BiologyCell Biology and Cell structure
cell structures
93,2520
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,434907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,155125
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,761210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,711198
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user