Your body is constantly working behind the scenes to keep... Show more
Biology128 views·Updated May 19, 2026·7 pagesHigh School Biology Paper 2 Notes (Combined Higher Level)
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_yp5hnpjimq8rvnk8x9m@_yp5hnpjimq8rvnk8x9m
1 / 7
1
of 7
Homeostasis and Control Systems
Ever wonder how your body keeps everything running smoothly without you having to think about it? Homeostasis is your body's automatic control system that maintains perfect internal conditions for your cells to function properly.
Your body constantly monitors and adjusts three crucial things: blood glucose concentration, body temperature, and water and ion levels. Think of it like a thermostat in your house - it detects changes and automatically corrects them.
Every control system has three key parts: receptors (detect changes), coordination centres like your brain (process information), and effectors such as muscles or glands (carry out responses). The nervous system uses electrical impulses whilst hormones provide chemical responses.
Negative feedback is the control mechanism that keeps everything balanced. When blood glucose gets too high, your pancreas releases insulin to remove glucose from blood and store it as glycogen in your liver. When it's too low, glucagon breaks down stored glycogen back into glucose.
Quick Check: Remember that insulin lowers blood sugar, whilst glucagon raises it - they work as opposite partners!
2
of 7
The Nervous System in Action
Your nervous system is like your body's electrical wiring, enabling you to react instantly to your surroundings and coordinate behaviour. It's absolutely crucial for survival - imagine not being able to pull your hand away from something hot!
Here's how a reflex arc works when you touch something painful: receptors detect the stimulus, sensory neurones carry the message to your central nervous system, relay neurones process it, motor neurones send commands to effectors (usually muscles), and you rapidly withdraw from danger - all without conscious thought.
Neurones aren't directly connected to each other. At synapses (gaps between neurones), electrical impulses trigger chemical release. These chemicals diffuse across the gap and generate new electrical impulses in the next neurone.
You can test reaction times using the ruler drop experiment. Hold a ruler vertically, have someone catch it when you drop it, then measure the distance it falls. Caffeine typically improves reaction times by making your nervous system more alert.
Top Tip: Reflexes are faster than conscious responses because they bypass your brain's thinking centres!
3
of 7
The Endocrine System and Hormones
Hormones are your body's chemical messengers, working more slowly than nerves but having longer-lasting effects. The endocrine system consists of glands that secrete hormones directly into your bloodstream.
The pituitary gland is your "master gland" because it secretes several hormones that control other glands. It's like the conductor of an orchestra, coordinating everything else. Thyroxine from the thyroid gland increases your metabolic rate, whilst adrenaline from adrenal glands prepares you for "fight or flight" during stress.
Blood glucose control demonstrates negative feedback perfectly. When glucose levels rise, your pancreas releases insulin, causing glucose to move from blood into cells. Excess glucose converts to glycogen for storage in liver and muscle cells.
Diabetes occurs when this system fails. Type 1 diabetes means your pancreas can't produce enough insulin (treated with insulin injections). Type 2 diabetes means your cells lose their ability to respond to insulin (often linked to obesity and treated with drugs and lifestyle changes).
Remember: Insulin acts like a key, unlocking cells so glucose can enter and be used for energy!
4
of 7
Controlling Fertility
Understanding fertility control gives you important knowledge about reproductive health choices. There are several methods for both reducing and increasing fertility.
Hormonal contraception like the pill contains oestrogen and progesterone that inhibit FSH, preventing eggs from maturing and being released. Injections, implants, and patches provide slow-release progesterone for months or years.
Non-hormonal methods include barrier methods (condoms, diaphragms) that prevent sperm reaching the egg, intrauterine devices that prevent embryo implantation, spermicidal creams, and surgical sterilisation.
IVF treatment helps increase fertility by giving women FSH and LH hormones to stimulate multiple egg growth. Eggs are collected, fertilised with sperm in laboratory conditions, then one or two embryos are inserted into the woman's uterus. However, IVF can be emotionally and physically stressful, has relatively low success rates, and may lead to risky multiple births.
Key Point: Fertility treatments offer hope for parenthood but come with significant physical, emotional, and financial considerations.
5
of 7
Sexual and Asexual Reproduction
Reproduction comes in two fundamentally different forms, each with distinct advantages. Asexual reproduction involves just one parent with no fusion of sex cells, producing genetically identical offspring.
Many organisms reproduce asexually - strawberry plants send out runners that grow new plants, fungi release spores, and malarial protists reproduce this way inside human hosts. It's quick and efficient but produces no genetic variation.
Sexual reproduction involves fusing male and female gametes (sperm and egg cells in animals, pollen and egg cells in plants). This requires meiosis, a special type of cell division that's crucial for sexual reproduction.
During meiosis, cells divide twice to create four genetically different gametes, each with half the chromosome number of the parent cell. Chromosomes replicate, pair up, then separate twice. When gametes fuse during fertilisation, the full chromosome number is restored, but genetic mixing creates variation.
Essential Understanding: Meiosis halves chromosome numbers so fertilisation can restore them - this genetic shuffling drives evolution!
6
of 7
DNA, Genes and Inheritance
Your genome - all the genetic material in your cells - is like an instruction manual written in DNA. This incredible molecule, contained in chromosomes within your cell nucleus, determines many of your characteristics.
Genes are small sections of DNA that code for specific proteins by determining amino acid sequences. Each gene can exist in different forms called alleles. You inherit two alleles for every gene - one from each parent.
Your genotype (combination of alleles) determines your phenotype (how characteristics are expressed). Dominant alleles are expressed even if you only have one copy, whilst recessive alleles need two copies to be expressed. When both alleles are the same, you're homozygous; when different, you're heterozygous.
Understanding genome structure helps doctors identify genes linked to inherited disorders like polydactyly and cystic fibrosis (caused by recessive genes). This knowledge advances treatments and helps us understand human evolution.
Fascinating Fact: Your genome contains about 3 billion DNA base pairs - enough information to fill thousands of books!
7
of 7
Reproductive Hormones and the Menstrual Cycle
Reproductive hormones control one of your body's most complex biological processes. Oestrogen from ovaries is the main female sex hormone controlling egg maturation and release, whilst testosterone from testes stimulates continuous sperm production in males.
The menstrual cycle involves four key hormones working in precise coordination. Follicle Stimulating Hormone (FSH) from the pituitary gland causes eggs to mature and stimulates oestrogen production. Oestrogen then inhibits FSH release, stimulates Luteinising Hormone (LH) release, and rebuilds the uterus lining.
LH triggers ovulation - the release of a mature egg from the ovary. Progesterone, produced by empty follicles, maintains the uterus lining during the cycle's second half and inhibits both FSH and LH release.
This intricate hormone dance repeats approximately every 28 days. Understanding these interactions explains how hormonal contraception works and why fertility treatments manipulate these same hormone pathways.
Key Insight: The menstrual cycle demonstrates negative feedback perfectly - each hormone's effects trigger responses that eventually switch it off!
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Biology128 views·Updated May 19, 2026·7 pagesHigh School Biology Paper 2 Notes (Combined Higher Level)
_
_yp5hnpjimq8rvnk8x9m@_yp5hnpjimq8rvnk8x9m
Your body is constantly working behind the scenes to keep everything perfectly balanced, like an incredibly sophisticated control system. These biological processes - from maintaining blood sugar levels to producing hormones for reproduction - are essential for keeping you alive... Show more
1
of 7Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Homeostasis and Control Systems
Ever wonder how your body keeps everything running smoothly without you having to think about it? Homeostasis is your body's automatic control system that maintains perfect internal conditions for your cells to function properly.
Your body constantly monitors and adjusts three crucial things: blood glucose concentration, body temperature, and water and ion levels. Think of it like a thermostat in your house - it detects changes and automatically corrects them.
Every control system has three key parts: receptors (detect changes), coordination centres like your brain (process information), and effectors such as muscles or glands (carry out responses). The nervous system uses electrical impulses whilst hormones provide chemical responses.
Negative feedback is the control mechanism that keeps everything balanced. When blood glucose gets too high, your pancreas releases insulin to remove glucose from blood and store it as glycogen in your liver. When it's too low, glucagon breaks down stored glycogen back into glucose.
Quick Check: Remember that insulin lowers blood sugar, whilst glucagon raises it - they work as opposite partners!
2
of 7Sign up to see the content. It's free!
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The Nervous System in Action
Your nervous system is like your body's electrical wiring, enabling you to react instantly to your surroundings and coordinate behaviour. It's absolutely crucial for survival - imagine not being able to pull your hand away from something hot!
Here's how a reflex arc works when you touch something painful: receptors detect the stimulus, sensory neurones carry the message to your central nervous system, relay neurones process it, motor neurones send commands to effectors (usually muscles), and you rapidly withdraw from danger - all without conscious thought.
Neurones aren't directly connected to each other. At synapses (gaps between neurones), electrical impulses trigger chemical release. These chemicals diffuse across the gap and generate new electrical impulses in the next neurone.
You can test reaction times using the ruler drop experiment. Hold a ruler vertically, have someone catch it when you drop it, then measure the distance it falls. Caffeine typically improves reaction times by making your nervous system more alert.
Top Tip: Reflexes are faster than conscious responses because they bypass your brain's thinking centres!
3
of 7Sign up to see the content. It's free!
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The Endocrine System and Hormones
Hormones are your body's chemical messengers, working more slowly than nerves but having longer-lasting effects. The endocrine system consists of glands that secrete hormones directly into your bloodstream.
The pituitary gland is your "master gland" because it secretes several hormones that control other glands. It's like the conductor of an orchestra, coordinating everything else. Thyroxine from the thyroid gland increases your metabolic rate, whilst adrenaline from adrenal glands prepares you for "fight or flight" during stress.
Blood glucose control demonstrates negative feedback perfectly. When glucose levels rise, your pancreas releases insulin, causing glucose to move from blood into cells. Excess glucose converts to glycogen for storage in liver and muscle cells.
Diabetes occurs when this system fails. Type 1 diabetes means your pancreas can't produce enough insulin (treated with insulin injections). Type 2 diabetes means your cells lose their ability to respond to insulin (often linked to obesity and treated with drugs and lifestyle changes).
Remember: Insulin acts like a key, unlocking cells so glucose can enter and be used for energy!
4
of 7Sign up to see the content. It's free!
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Controlling Fertility
Understanding fertility control gives you important knowledge about reproductive health choices. There are several methods for both reducing and increasing fertility.
Hormonal contraception like the pill contains oestrogen and progesterone that inhibit FSH, preventing eggs from maturing and being released. Injections, implants, and patches provide slow-release progesterone for months or years.
Non-hormonal methods include barrier methods (condoms, diaphragms) that prevent sperm reaching the egg, intrauterine devices that prevent embryo implantation, spermicidal creams, and surgical sterilisation.
IVF treatment helps increase fertility by giving women FSH and LH hormones to stimulate multiple egg growth. Eggs are collected, fertilised with sperm in laboratory conditions, then one or two embryos are inserted into the woman's uterus. However, IVF can be emotionally and physically stressful, has relatively low success rates, and may lead to risky multiple births.
Key Point: Fertility treatments offer hope for parenthood but come with significant physical, emotional, and financial considerations.
5
of 7Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Sexual and Asexual Reproduction
Reproduction comes in two fundamentally different forms, each with distinct advantages. Asexual reproduction involves just one parent with no fusion of sex cells, producing genetically identical offspring.
Many organisms reproduce asexually - strawberry plants send out runners that grow new plants, fungi release spores, and malarial protists reproduce this way inside human hosts. It's quick and efficient but produces no genetic variation.
Sexual reproduction involves fusing male and female gametes (sperm and egg cells in animals, pollen and egg cells in plants). This requires meiosis, a special type of cell division that's crucial for sexual reproduction.
During meiosis, cells divide twice to create four genetically different gametes, each with half the chromosome number of the parent cell. Chromosomes replicate, pair up, then separate twice. When gametes fuse during fertilisation, the full chromosome number is restored, but genetic mixing creates variation.
Essential Understanding: Meiosis halves chromosome numbers so fertilisation can restore them - this genetic shuffling drives evolution!
6
of 7Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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DNA, Genes and Inheritance
Your genome - all the genetic material in your cells - is like an instruction manual written in DNA. This incredible molecule, contained in chromosomes within your cell nucleus, determines many of your characteristics.
Genes are small sections of DNA that code for specific proteins by determining amino acid sequences. Each gene can exist in different forms called alleles. You inherit two alleles for every gene - one from each parent.
Your genotype (combination of alleles) determines your phenotype (how characteristics are expressed). Dominant alleles are expressed even if you only have one copy, whilst recessive alleles need two copies to be expressed. When both alleles are the same, you're homozygous; when different, you're heterozygous.
Understanding genome structure helps doctors identify genes linked to inherited disorders like polydactyly and cystic fibrosis (caused by recessive genes). This knowledge advances treatments and helps us understand human evolution.
Fascinating Fact: Your genome contains about 3 billion DNA base pairs - enough information to fill thousands of books!
7
of 7Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Reproductive Hormones and the Menstrual Cycle
Reproductive hormones control one of your body's most complex biological processes. Oestrogen from ovaries is the main female sex hormone controlling egg maturation and release, whilst testosterone from testes stimulates continuous sperm production in males.
The menstrual cycle involves four key hormones working in precise coordination. Follicle Stimulating Hormone (FSH) from the pituitary gland causes eggs to mature and stimulates oestrogen production. Oestrogen then inhibits FSH release, stimulates Luteinising Hormone (LH) release, and rebuilds the uterus lining.
LH triggers ovulation - the release of a mature egg from the ovary. Progesterone, produced by empty follicles, maintains the uterus lining during the cycle's second half and inhibits both FSH and LH release.
This intricate hormone dance repeats approximately every 28 days. Understanding these interactions explains how hormonal contraception works and why fertility treatments manipulate these same hormone pathways.
Key Insight: The menstrual cycle demonstrates negative feedback perfectly - each hormone's effects trigger responses that eventually switch it off!
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?
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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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