GCSE AQA Biology 3 very detailed revision notes

These notes are very detailed and go beyond what we need to know for the syllabus but I find this helps me to understand. If you're the same, then I suggest you read my notes here. If not, then don't worry too much about learning some of the bits you've never seen before. Also, I didn't intend on distributing these so the spelling and grammar's probably not great but its all accurate and useful.

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Page 1

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Biology 3

Gas and solute exchange
Structure of plants
Stomata conditions
Other parts
Transport of mineral ions into a root hair
Transport of water into root hairs
The breathing system
Breathing in
Breathing out
Absorption in the digestive system
Circulatory system

Page 2

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Biology 3

Respiration and oxygen debt
Aerobic respiration
Anaerobic respiration
Oxygen debt
The Kidney
Urinary system
Kidney Failure
Renal dialysis
Peritoneal dialysis
Kidney transplant
Opt-in or opt-out
Theory of Biogenesis
Growth curve of micro-organisms
Using microorganisms to make foods
Bacteria and fungi

Page 3

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Biology 3

Biogas generators
Batch generator
Continuous generators
Designing a generator
Environmental and economic effects of using biofuels
Aseptic technique


Page 4

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Biology 3

Biology 3
Gas and solute exchange
Life processes need substances before they can occur
Waste substances need removing
These substances move by diffusion, osmosis or active transport

Particles move from high concentration to low concentration
It moves along a concentration gradient

Similar to diffusion but only…

Page 5

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Biology 3

Night Narrower Preserve water when carbon
dioxide isn't needed for
Day Open Allow carbon dioxide in for

Other parts
The stem supports the plant and leaves and it lifts up the leaves towards light
The stem also contains the phloem and xylem
The phloem transports sugars…

Page 6

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Biology 3

The lungs are protected by the rib cage
The air first passes though the mouth, past the epiglottis and then into the trachea
The trachea splits into two bronchi to each lung
The bronchi split into smaller tubes called bronchioles
These end with alveoli where gaseous exchange takes…

Page 7

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Biology 3

Arteries carry blood away from the heart at high pressure. It is usually oxygenated except
for in the pulmonary artery
Arteries eventually split off into arterioles and then capillaries which take blood to every
cell in the body.
The veins then take the used, deoxygenated blood back to…

Page 8

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Biology 3


Double circulatory system
Blood goes twice through the heart for one trip around the body
A double circulatory system is needed in mammals and birds as there is a higher rate of
respiration and more oxygen demand. Since pressure drops after each capillary bed
(humans have two…

Page 9

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Biology 3


o White blood cells (part of the immune system
o Red blood cells (carry oxygen)
o Plasma (carry everything else)
o Platelets (for blood clotting)

Red blood cells
Carry oxygen from the lungs to all other cells
Biconcave disk to increase surface area for diffusion,…

Page 10

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Biology 3

Blood plasma
The blood plasma carries nearly everything
o Red blood cells
o White blood cells
o Platelets
o Glucose
o Amino acids
o Carbon dioxide (hydrogen carbonate ions)
o Urea
o Hormones
o Antibodies
o Antitoxins

When you exercise, your body adapts to an increased demand…


Florence Chapman

this is perfect!! thank you

Anisa -Team GR

Really useful!

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