Your body is like a brilliant control system that keeps... Show more
Biology1,472 views·Updated Jun 15, 2026·15 pagesAQA Biology Paper 2: Exam Preparation Guide
leema .@leema.x
1 / 10
1
of 10
Homeostasis & The Nervous System
Think of homeostasis as your body's personal thermostat - it's constantly adjusting your internal conditions to keep everything working perfectly. Your body needs to regulate three crucial things: blood glucose levels, internal temperature, and water levels.
Your nervous system is split into two main parts. The CNS (central nervous system) includes your brain and spinal cord - basically your body's command centre. The peripheral nervous system contains all the other nerves that carry messages around your body.
When you touch something hot, a reflex arc kicks in faster than you can think. A receptor detects the heat, sensory neurons carry the signal to your spinal cord, relay neurons process it, and motor neurons tell your muscles to pull away. At each connection point called a synapse, chemical messengers called neurotransmitters help the electrical signal jump between neurons.
Quick Tip: Remember that reflexes bypass your brain completely - that's why they're so fast!
2
of 10
Temperature Control & The Endocrine System
Thermoregulation is your body's clever way of maintaining the perfect internal temperature. Your brain constantly monitors your blood temperature and responds accordingly. When you're too hot, you sweat (the evaporating water cools you down) and your blood vessels dilate near your skin. When you're cold, you shiver to generate heat and your blood vessels constrict to keep warmth in.
The endocrine system works alongside your nervous system but uses hormones instead of electrical signals. It's slower but longer-lasting. Your pituitary gland acts as the master controller, sending signals to other glands around your body.
Key glands include your thyroid (controls growth and metabolism), adrenal glands (release adrenaline), pancreas (controls blood sugar with insulin), and reproductive organs. These glands release hormones that travel through your bloodstream to their target organs.
Remember: Nervous system = fast but short-term; Endocrine system = slower but long-lasting effects!
3
of 10
Blood Sugar Control & Diabetes
Your body needs to keep blood glucose levels just right - not too high, not too low. When blood sugar rises after eating, your pancreas releases insulin, which tells your cells to absorb glucose for energy. Any excess gets converted to glycogen and stored in your liver.
When blood sugar drops, your pancreas releases glucagon, which tells your liver to convert stored glycogen back into glucose. This is a perfect example of negative feedback - your body automatically corrects any changes.
Type 1 diabetes usually develops early in life when the pancreas can't produce enough insulin, requiring daily injections. Type 2 diabetes develops later when cells become resistant to insulin - they just stop responding to it properly. Obesity significantly increases your risk of developing Type 2 diabetes.
Exam Tip: Learn the insulin/glucagon cycle - it's a classic negative feedback example that often appears in tests!
4
of 10
Water Balance & Contraception
Your kidneys are brilliant filters that control water and waste levels in your body. They remove excess water from your blood to make urine, which also contains urea - a toxic waste product from breaking down proteins. Your kidneys cleverly reabsorb useful substances like glucose and minerals.
Water balance is crucial for your cells. Too little water causes cells to shrivel (flaccid), whilst too much water can make them burst (turgid) as water moves in by osmosis.
Contraception prevents pregnancy through various methods. Hormonal methods like FSH-inhibiting pills stop eggs from maturing, whilst progesterone injections prevent egg release. Barrier methods like condoms physically block sperm. The contraceptive pill is highly effective but needs daily use and can have side effects like increased blood clot risk.
Key Point: Only condoms protect against both pregnancy AND sexually transmitted infections!
5
of 10
The Menstrual Cycle
The menstrual cycle is a monthly process controlled by four key hormones working together. FSH from the pituitary gland causes eggs to mature and triggers oestrogen production from the ovaries.
Oestrogen thickens the uterus lining and blocks FSH (preventing more eggs from maturing). It also triggers LH release, which causes ovulation - the egg's release around day 14. Progesterone then maintains the uterus lining, preparing for a potential pregnancy.
The cycle follows a predictable pattern: Days 1-7 involve the breakdown of the uterus lining (your period), the lining rebuilds until day 14 when ovulation occurs, and if no fertilisation happens, progesterone levels drop around day 21, starting a new cycle.
Memory Aid: Think "F.O.L.P" - FSH starts it, Oestrogen builds it up, LH releases the egg, Progesterone maintains it!
6
of 10
Fertility Treatments
Infertility affects many couples for various reasons including hormonal imbalances, blocked fallopian tubes, or cancer treatments. Same-sex couples also need fertility assistance to have biological children.
Fertility treatments include hormone injections (FSH and LH) to stimulate egg production and IVF . IVF involves fertilising eggs outside the body, then implanting healthy embryos into the uterus. Though effective, it's emotionally and financially demanding.
Embryo screening during IVF allows detection of genetic disorders, but raises ethical questions. Whilst it prevents suffering from inherited diseases, it's expensive and some argue it increases prejudice against disabilities. The decision to screen embryos remains deeply personal for couples.
Think About It: Fertility treatments give hope to many families, but the ethical considerations around embryo selection continue to spark important debates.
7
of 10
Reproduction & Meiosis
Sexual reproduction involves male and female gametes (sperm and eggs in animals, pollen and eggs in plants) combining to create offspring with genetic variation. Each gamete contains 23 chromosomes, creating a 46-chromosome baby.
Asexual reproduction needs only one parent and produces identical offspring through mitosis (in complex organisms) or binary fission (in bacteria). There's no genetic variation, but it's much faster than sexual reproduction.
Meiosis creates gametes with half the normal genetic material (haploid cells from diploid parent cells). During meiosis, DNA replicates, chromosomes line up and separate, then the cells divide twice, creating four genetically unique gametes from one parent cell.
Key Difference: Mitosis creates identical cells for growth; meiosis creates unique gametes for reproduction!
8
of 10
Genetics & Inheritance
A gene is a small section of DNA that codes for specific characteristics, whilst your genome is your complete set of genetic material. Scientists use genome analysis to identify genes linked to diseases.
Your genotype refers to the genetic code (letters like BB or Bb), whilst your phenotype is the actual characteristic you can see (like brown eyes). Alleles are different versions of the same gene - you inherit one from each parent.
Dominant alleles (shown with capital letters) always show their characteristic when present. Recessive alleles (lowercase letters) only appear when you have two copies. Polydactyly is caused by a dominant allele, whilst cystic fibrosis results from a recessive allele.
Quick Check: If you're heterozygous (Bb), the dominant characteristic will show in your phenotype!
9
of 10
Variation & Mutations
Variation comes from both genetic and environmental factors. Two identical plants will grow differently if one's by a window and the other's in darkness - genes set the potential, but environment affects the outcome.
Mutations are random DNA changes that occur continuously and can be inherited. Most genetic variants have little effect on an organism, but occasionally they cause significant changes like cystic fibrosis.
Some characteristics like eye colour are controlled by multiple genes, so a mutation in one gene might cause only subtle changes. Environmental factors like diet, exercise, and lifestyle also significantly influence how your genes are expressed.
Remember: Your height potential comes from your genes, but whether you reach it depends on nutrition, sleep, and health during growth!
10
of 10
Evolution & Natural Selection
Darwin's theory of natural selection explains how species evolve over time. All living things show variation, those best adapted to their environment survive and reproduce, passing beneficial genes to the next generation. Evidence includes fossils and antibiotic resistance in bacteria.
Evolution can lead to new species when natural selection changes organisms so dramatically that they can't interbreed with their ancestors. However, species can also face extinction through habitat destruction, predators, disease, or catastrophic events like volcanic eruptions.
Antibiotic resistance perfectly demonstrates natural selection in action. When doctors prescribe antibiotics, most bacteria die, but resistant ones survive and multiply. This creates "superbugs" like MRSA that resist multiple antibiotics, making infections harder to treat.
Important: Always complete your full course of antibiotics - stopping early allows resistant bacteria to survive and multiply!
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Biology1,472 views·Updated Jun 15, 2026·15 pagesAQA Biology Paper 2: Exam Preparation Guide
leema .@leema.x
Your body is like a brilliant control system that keeps everything running smoothly without you even thinking about it. From controlling your temperature when it's hot outside to managing your blood sugar after eating a chocolate bar, homeostasis ensures all... Show more
1
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Homeostasis & The Nervous System
Think of homeostasis as your body's personal thermostat - it's constantly adjusting your internal conditions to keep everything working perfectly. Your body needs to regulate three crucial things: blood glucose levels, internal temperature, and water levels.
Your nervous system is split into two main parts. The CNS (central nervous system) includes your brain and spinal cord - basically your body's command centre. The peripheral nervous system contains all the other nerves that carry messages around your body.
When you touch something hot, a reflex arc kicks in faster than you can think. A receptor detects the heat, sensory neurons carry the signal to your spinal cord, relay neurons process it, and motor neurons tell your muscles to pull away. At each connection point called a synapse, chemical messengers called neurotransmitters help the electrical signal jump between neurons.
Quick Tip: Remember that reflexes bypass your brain completely - that's why they're so fast!
2
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Temperature Control & The Endocrine System
Thermoregulation is your body's clever way of maintaining the perfect internal temperature. Your brain constantly monitors your blood temperature and responds accordingly. When you're too hot, you sweat (the evaporating water cools you down) and your blood vessels dilate near your skin. When you're cold, you shiver to generate heat and your blood vessels constrict to keep warmth in.
The endocrine system works alongside your nervous system but uses hormones instead of electrical signals. It's slower but longer-lasting. Your pituitary gland acts as the master controller, sending signals to other glands around your body.
Key glands include your thyroid (controls growth and metabolism), adrenal glands (release adrenaline), pancreas (controls blood sugar with insulin), and reproductive organs. These glands release hormones that travel through your bloodstream to their target organs.
Remember: Nervous system = fast but short-term; Endocrine system = slower but long-lasting effects!
3
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Blood Sugar Control & Diabetes
Your body needs to keep blood glucose levels just right - not too high, not too low. When blood sugar rises after eating, your pancreas releases insulin, which tells your cells to absorb glucose for energy. Any excess gets converted to glycogen and stored in your liver.
When blood sugar drops, your pancreas releases glucagon, which tells your liver to convert stored glycogen back into glucose. This is a perfect example of negative feedback - your body automatically corrects any changes.
Type 1 diabetes usually develops early in life when the pancreas can't produce enough insulin, requiring daily injections. Type 2 diabetes develops later when cells become resistant to insulin - they just stop responding to it properly. Obesity significantly increases your risk of developing Type 2 diabetes.
Exam Tip: Learn the insulin/glucagon cycle - it's a classic negative feedback example that often appears in tests!
4
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Water Balance & Contraception
Your kidneys are brilliant filters that control water and waste levels in your body. They remove excess water from your blood to make urine, which also contains urea - a toxic waste product from breaking down proteins. Your kidneys cleverly reabsorb useful substances like glucose and minerals.
Water balance is crucial for your cells. Too little water causes cells to shrivel (flaccid), whilst too much water can make them burst (turgid) as water moves in by osmosis.
Contraception prevents pregnancy through various methods. Hormonal methods like FSH-inhibiting pills stop eggs from maturing, whilst progesterone injections prevent egg release. Barrier methods like condoms physically block sperm. The contraceptive pill is highly effective but needs daily use and can have side effects like increased blood clot risk.
Key Point: Only condoms protect against both pregnancy AND sexually transmitted infections!
5
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
The Menstrual Cycle
The menstrual cycle is a monthly process controlled by four key hormones working together. FSH from the pituitary gland causes eggs to mature and triggers oestrogen production from the ovaries.
Oestrogen thickens the uterus lining and blocks FSH (preventing more eggs from maturing). It also triggers LH release, which causes ovulation - the egg's release around day 14. Progesterone then maintains the uterus lining, preparing for a potential pregnancy.
The cycle follows a predictable pattern: Days 1-7 involve the breakdown of the uterus lining (your period), the lining rebuilds until day 14 when ovulation occurs, and if no fertilisation happens, progesterone levels drop around day 21, starting a new cycle.
Memory Aid: Think "F.O.L.P" - FSH starts it, Oestrogen builds it up, LH releases the egg, Progesterone maintains it!
6
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Fertility Treatments
Infertility affects many couples for various reasons including hormonal imbalances, blocked fallopian tubes, or cancer treatments. Same-sex couples also need fertility assistance to have biological children.
Fertility treatments include hormone injections (FSH and LH) to stimulate egg production and IVF . IVF involves fertilising eggs outside the body, then implanting healthy embryos into the uterus. Though effective, it's emotionally and financially demanding.
Embryo screening during IVF allows detection of genetic disorders, but raises ethical questions. Whilst it prevents suffering from inherited diseases, it's expensive and some argue it increases prejudice against disabilities. The decision to screen embryos remains deeply personal for couples.
Think About It: Fertility treatments give hope to many families, but the ethical considerations around embryo selection continue to spark important debates.
7
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Reproduction & Meiosis
Sexual reproduction involves male and female gametes (sperm and eggs in animals, pollen and eggs in plants) combining to create offspring with genetic variation. Each gamete contains 23 chromosomes, creating a 46-chromosome baby.
Asexual reproduction needs only one parent and produces identical offspring through mitosis (in complex organisms) or binary fission (in bacteria). There's no genetic variation, but it's much faster than sexual reproduction.
Meiosis creates gametes with half the normal genetic material (haploid cells from diploid parent cells). During meiosis, DNA replicates, chromosomes line up and separate, then the cells divide twice, creating four genetically unique gametes from one parent cell.
Key Difference: Mitosis creates identical cells for growth; meiosis creates unique gametes for reproduction!
8
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Genetics & Inheritance
A gene is a small section of DNA that codes for specific characteristics, whilst your genome is your complete set of genetic material. Scientists use genome analysis to identify genes linked to diseases.
Your genotype refers to the genetic code (letters like BB or Bb), whilst your phenotype is the actual characteristic you can see (like brown eyes). Alleles are different versions of the same gene - you inherit one from each parent.
Dominant alleles (shown with capital letters) always show their characteristic when present. Recessive alleles (lowercase letters) only appear when you have two copies. Polydactyly is caused by a dominant allele, whilst cystic fibrosis results from a recessive allele.
Quick Check: If you're heterozygous (Bb), the dominant characteristic will show in your phenotype!
9
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Variation & Mutations
Variation comes from both genetic and environmental factors. Two identical plants will grow differently if one's by a window and the other's in darkness - genes set the potential, but environment affects the outcome.
Mutations are random DNA changes that occur continuously and can be inherited. Most genetic variants have little effect on an organism, but occasionally they cause significant changes like cystic fibrosis.
Some characteristics like eye colour are controlled by multiple genes, so a mutation in one gene might cause only subtle changes. Environmental factors like diet, exercise, and lifestyle also significantly influence how your genes are expressed.
Remember: Your height potential comes from your genes, but whether you reach it depends on nutrition, sleep, and health during growth!
10
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Evolution & Natural Selection
Darwin's theory of natural selection explains how species evolve over time. All living things show variation, those best adapted to their environment survive and reproduce, passing beneficial genes to the next generation. Evidence includes fossils and antibiotic resistance in bacteria.
Evolution can lead to new species when natural selection changes organisms so dramatically that they can't interbreed with their ancestors. However, species can also face extinction through habitat destruction, predators, disease, or catastrophic events like volcanic eruptions.
Antibiotic resistance perfectly demonstrates natural selection in action. When doctors prescribe antibiotics, most bacteria die, but resistant ones survive and multiply. This creates "superbugs" like MRSA that resist multiple antibiotics, making infections harder to treat.
Important: Always complete your full course of antibiotics - stopping early allows resistant bacteria to survive and multiply!
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.
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Students love us — and so will you.
4.6/5App Store
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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 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