Unit 1 Biology Notes GCSE :) x

about 30 pages of key stuff you need to know for the aqa gcse exam, hope it helps. I wrote most of it myself, and i try to not baffle on :) summary at each section xxxx

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  • Created by: wahey
  • Created on: 17-12-11 00:10
Preview of Unit 1 Biology Notes GCSE :) x

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Coordination and Control
For example...
receptors in the eyes which are sensitive to light ­ `Light receptors'
receptors in the ears which are sensitive to sound ­ `Sound and balance receptors'
receptors in the ears which are sensitive to changes in position and enable us to keep our balance
receptors on the tongue and in the nose which are sensitive to chemicals and enable us to taste and to
smell `Taste and smell receptors'

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pressure and temperature receptors'
Neurons and Reflexes
Remember: the 3 types of neurones, sensory, motor and relay.
A typical NEURONE:
Neurons transmit electrical impulses very quickly around the body.…read more

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Difference between a Sensory Neurone and a Motor Neurone:
Sensory Neurones Motor Neurones
Transmit information to the spinal cord Transmit information from the spinal cord
to an effector.…read more

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A muscle reacts by contracting, a gland responds by secreting.…read more

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Example of a reflex action...
The retina is the light sensitive part of the eye and is covered in rods and cones that detect light.
Rods are more sensitive in dim light but only sense black and white.…read more

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Cones (found in the fovea) are sensitive to colour but not so good with dim light.…read more

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Skin and Temperature
All enzymes work best at a certain temperature, so in our bodies it would be 37 degrees Celsius. To keep this you have to...
Shiver when your body is cold, this increases your metabolism to produce heat.
When you're too hot you produce sweat which cools you down.
Receptors in the thermoregulatory centre are sensitive to blood temperature in the brain and also receive impulses from the skin.…read more

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When you're too COLD
Hairs stand on end to keep you warm
No sweat is produced
The blood supply to the skin closes off.
Ion (salts) content of the body
This is
controlled to
protect cells by
avoiding too
much water
entering or
leaving them.…read more

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Hormones are chemical substances that help processes in our body. They are secreted from GLANDS and travel to their target
organ in the bloodstream. The main gland is in the base of the brain, known as the Pituitary gland. Hormones are proteins that
basically act as chemical messengers. Not every cell has the right receptor molecules on the surface of its cell membrane. The
hormone molecules only bind to those cells that do have the receptor molecules.…read more


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