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fasai✧
02/12/2025
Biology
Biology unit 2 summary notes national 5
487
•
2 Dec 2025
•
National 5 Biology Unit 2 Summary Notes
fasai✧
@myfxsai
1 / 10
Producing New Cells
Ever wondered how you grew from a tiny baby to your current size? Your body has been constantly creating new cells through a process called mitosis. We need these new cells for growth and to repair damaged tissue when you get cuts or bruises.
DNA is like your body's instruction manual, stored in structures called chromosomes inside each cell's nucleus. Think of chromosomes as tightly packed bundles of DNA - you've got 23 pairs of them, with one set inherited from each parent.
When chromosomes copy themselves, they form chromatids joined at a point called the centromere. This copying process is essential because each new cell needs its own complete set of instructions to function properly.
Key Point: Every cell in your body (except sex cells) contains 46 chromosomes - that's two complete sets of 23!
Haploid and Diploid Cells
Not all cells contain the full set of chromosomes. Gametes (sex cells like sperm and eggs) are haploid, meaning they only have 23 chromosomes each. Regular body cells are diploid with 46 chromosomes.
When sperm and egg cells combine during fertilisation, you get 23 + 23 = 46 chromosomes. This creates a diploid cell with a complete set of genetic information from both parents.
Cell division follows a simple pattern: the mother cell prepares to divide, the nucleus splits, then the cytoplasm divides. In plant cells, a new cell wall also forms. The end result? Two identical daughter cells, each with the same genetic information as the original.
Remember: Haploid = half the chromosomes (gametes), Diploid = full set (body cells)
Mitosis in Detail
Mitosis is the precise process your body uses to create two identical cells from one parent cell. It's like nature's photocopying machine, ensuring each new cell gets exactly the same genetic information.
The process has distinct stages: First, chromosomes become visible and the nuclear membrane disappears. Then chromosomes line up at the cell's centre, held in place by spindle fibres attached to their centromeres.
Next, these spindle fibres contract and pull the chromatids apart to opposite ends of the cell. Nuclear membranes reform around each set of chromosomes, the cytoplasm divides, and voilà - two identical daughter cells are born!
Cool Fact: Your body performs millions of mitotic divisions every day without you even noticing!
Cell Specialisation and Stem Cells
Stem cells are like cellular blank slates - they're unspecialised cells that can transform into any type of cell your body needs. Think of them as the ultimate shape-shifters of biology.
There are two main types: embryonic stem cells (found in early development) and tissue stem cells (found in places like bone marrow). These amazing cells can become skin cells, nerve cells, blood cells, or any other specialised cell type.
Specialised cells have specific jobs - skin cells protect you, nerve cells carry messages, and red blood cells transport oxygen. Stem cells are crucial for growth and repair, which is why stem cell research receives massive funding for treating diseases and injuries.
Medical Marvel: Researchers hope stem cells could help treat conditions like diabetes, heart disease, and spinal injuries!
Cell Organisation
Your body is brilliantly organised, like a perfectly structured company with different levels of management. It all starts with individual cells - the basic building blocks of life.
Groups of similar cells working together form tissues (like muscle tissue or skin tissue). Different tissues combine to create organs (your heart, liver, or brain). Finally, organs work together in organ systems (like your digestive system or circulatory system).
This hierarchical organisation exists in plants too! From individual plant cells to tissues like xylem and phloem, then organs like leaves and roots, and finally complete organ systems for transport and reproduction.
Think of it: Cell → Tissue → Organ → Organ System - each level builds on the previous one!
Nervous System Control
Your nervous system is like your body's high-speed internet, providing fast, immediate communication between your brain and every part of your body. It's made up of the central nervous system (brain and spinal cord) and the peripheral nervous system (all other nerves).
Your brain has three key regions with different jobs. The cerebrum handles conscious thought, memory, emotions, and movement. The cerebellum controls balance and coordination - essential for sports and even just walking. The medulla manages unconscious actions like breathing and heart rate.
This system works 24/7, processing millions of signals every second. Whether you're solving maths problems (cerebrum), riding a bike (cerebellum), or sleeping peacefully (medulla), different brain regions are constantly at work.
Amazing Fact: Your brain uses about 20% of your body's total energy - that's why thinking hard can make you feel tired!
Neurons and Communication
Neurons are the specialised cells that make your nervous system work, carrying electrical impulses at incredible speeds. They're perfectly designed for rapid communication throughout your body.
There are three types of neurons with different jobs: sensory neurons detect changes and send signals from sense organs to your brain, interneurons process information within your brain and spinal cord, and motor neurons carry commands from your brain to muscles and glands.
Your sense organs (skin, eyes, nose, tongue, ears) contain receptors that pick up different types of stimuli. These signals travel through neurons, crossing gaps called synapses where electrical signals temporarily become chemical messengers called neurotransmitters.
Lightning Fast: Some nerve impulses travel at speeds up to 120 metres per second - faster than most cars on a motorway!
Reflex Arcs
Reflex arcs are your body's emergency response system, designed to protect you from danger before you even realise what's happening. When you touch something hot, you pull your hand away instantly - that's a reflex arc in action.
The pathway is simple but brilliant: stimulus → receptor → sensory neuron → CNS → motor neuron → effector (muscle or gland) → response. This entire process bypasses conscious thought for speed.
At synapses, electrical impulses can't jump the gap directly. Instead, they trigger the release of chemical messengers that diffuse across the gap and restart the electrical signal on the other side. It's like passing a relay baton in a race.
Super Speed: Reflex actions can happen in as little as 0.1 seconds - much faster than conscious reactions!
Endocrine System and Hormones
Your endocrine system uses chemical messengers called hormones to control processes that don't need split-second timing. Unlike your nervous system, hormonal control is slower but longer-lasting.
Key glands include the pancreas (produces insulin), testes (produce testosterone), and ovaries (produce oestrogen). These hormones travel through your bloodstream to reach their target tissues, where they fit like keys into locks due to their complementary shapes.
Glucose control is a perfect example of hormonal regulation. When blood glucose is too high (after eating sweets), your pancreas releases insulin to store excess glucose as glycogen in your liver. When glucose is too low (during exercise), it releases glucagon to convert stored glycogen back to glucose.
Balancing Act: Your pancreas constantly monitors blood glucose levels, making tiny adjustments to keep you healthy!
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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
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The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
National 5 Biology Unit 2 Summary Notes
fasai✧
@myfxsai
Your body is constantly making new cells to help you grow and repair damage - this amazing process is called mitosis. We'll explore how cells divide, specialise into different types, and how your nervous and hormonal systems work together to... Show more
Producing New Cells
Ever wondered how you grew from a tiny baby to your current size? Your body has been constantly creating new cells through a process called mitosis. We need these new cells for growth and to repair damaged tissue when you get cuts or bruises.
DNA is like your body's instruction manual, stored in structures called chromosomes inside each cell's nucleus. Think of chromosomes as tightly packed bundles of DNA - you've got 23 pairs of them, with one set inherited from each parent.
When chromosomes copy themselves, they form chromatids joined at a point called the centromere. This copying process is essential because each new cell needs its own complete set of instructions to function properly.
Key Point: Every cell in your body (except sex cells) contains 46 chromosomes - that's two complete sets of 23!
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Haploid and Diploid Cells
Not all cells contain the full set of chromosomes. Gametes (sex cells like sperm and eggs) are haploid, meaning they only have 23 chromosomes each. Regular body cells are diploid with 46 chromosomes.
When sperm and egg cells combine during fertilisation, you get 23 + 23 = 46 chromosomes. This creates a diploid cell with a complete set of genetic information from both parents.
Cell division follows a simple pattern: the mother cell prepares to divide, the nucleus splits, then the cytoplasm divides. In plant cells, a new cell wall also forms. The end result? Two identical daughter cells, each with the same genetic information as the original.
Remember: Haploid = half the chromosomes (gametes), Diploid = full set (body cells)
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Mitosis in Detail
Mitosis is the precise process your body uses to create two identical cells from one parent cell. It's like nature's photocopying machine, ensuring each new cell gets exactly the same genetic information.
The process has distinct stages: First, chromosomes become visible and the nuclear membrane disappears. Then chromosomes line up at the cell's centre, held in place by spindle fibres attached to their centromeres.
Next, these spindle fibres contract and pull the chromatids apart to opposite ends of the cell. Nuclear membranes reform around each set of chromosomes, the cytoplasm divides, and voilà - two identical daughter cells are born!
Cool Fact: Your body performs millions of mitotic divisions every day without you even noticing!
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Cell Specialisation and Stem Cells
Stem cells are like cellular blank slates - they're unspecialised cells that can transform into any type of cell your body needs. Think of them as the ultimate shape-shifters of biology.
There are two main types: embryonic stem cells (found in early development) and tissue stem cells (found in places like bone marrow). These amazing cells can become skin cells, nerve cells, blood cells, or any other specialised cell type.
Specialised cells have specific jobs - skin cells protect you, nerve cells carry messages, and red blood cells transport oxygen. Stem cells are crucial for growth and repair, which is why stem cell research receives massive funding for treating diseases and injuries.
Medical Marvel: Researchers hope stem cells could help treat conditions like diabetes, heart disease, and spinal injuries!
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Cell Organisation
Your body is brilliantly organised, like a perfectly structured company with different levels of management. It all starts with individual cells - the basic building blocks of life.
Groups of similar cells working together form tissues (like muscle tissue or skin tissue). Different tissues combine to create organs (your heart, liver, or brain). Finally, organs work together in organ systems (like your digestive system or circulatory system).
This hierarchical organisation exists in plants too! From individual plant cells to tissues like xylem and phloem, then organs like leaves and roots, and finally complete organ systems for transport and reproduction.
Think of it: Cell → Tissue → Organ → Organ System - each level builds on the previous one!
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Nervous System Control
Your nervous system is like your body's high-speed internet, providing fast, immediate communication between your brain and every part of your body. It's made up of the central nervous system (brain and spinal cord) and the peripheral nervous system (all other nerves).
Your brain has three key regions with different jobs. The cerebrum handles conscious thought, memory, emotions, and movement. The cerebellum controls balance and coordination - essential for sports and even just walking. The medulla manages unconscious actions like breathing and heart rate.
This system works 24/7, processing millions of signals every second. Whether you're solving maths problems (cerebrum), riding a bike (cerebellum), or sleeping peacefully (medulla), different brain regions are constantly at work.
Amazing Fact: Your brain uses about 20% of your body's total energy - that's why thinking hard can make you feel tired!
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Neurons and Communication
Neurons are the specialised cells that make your nervous system work, carrying electrical impulses at incredible speeds. They're perfectly designed for rapid communication throughout your body.
There are three types of neurons with different jobs: sensory neurons detect changes and send signals from sense organs to your brain, interneurons process information within your brain and spinal cord, and motor neurons carry commands from your brain to muscles and glands.
Your sense organs (skin, eyes, nose, tongue, ears) contain receptors that pick up different types of stimuli. These signals travel through neurons, crossing gaps called synapses where electrical signals temporarily become chemical messengers called neurotransmitters.
Lightning Fast: Some nerve impulses travel at speeds up to 120 metres per second - faster than most cars on a motorway!
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Reflex Arcs
Reflex arcs are your body's emergency response system, designed to protect you from danger before you even realise what's happening. When you touch something hot, you pull your hand away instantly - that's a reflex arc in action.
The pathway is simple but brilliant: stimulus → receptor → sensory neuron → CNS → motor neuron → effector (muscle or gland) → response. This entire process bypasses conscious thought for speed.
At synapses, electrical impulses can't jump the gap directly. Instead, they trigger the release of chemical messengers that diffuse across the gap and restart the electrical signal on the other side. It's like passing a relay baton in a race.
Super Speed: Reflex actions can happen in as little as 0.1 seconds - much faster than conscious reactions!
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Endocrine System and Hormones
Your endocrine system uses chemical messengers called hormones to control processes that don't need split-second timing. Unlike your nervous system, hormonal control is slower but longer-lasting.
Key glands include the pancreas (produces insulin), testes (produce testosterone), and ovaries (produce oestrogen). These hormones travel through your bloodstream to reach their target tissues, where they fit like keys into locks due to their complementary shapes.
Glucose control is a perfect example of hormonal regulation. When blood glucose is too high (after eating sweets), your pancreas releases insulin to store excess glucose as glycogen in your liver. When glucose is too low (during exercise), it releases glucagon to convert stored glycogen back to glucose.
Balancing Act: Your pancreas constantly monitors blood glucose levels, making tiny adjustments to keep you healthy!
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Where can I download the Knowunity app?
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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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user