What happens when the concentration of water in the blood is too high. I.e. the Blood is dilute/LESS concentrated.
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15
Evaluate the benefits and risks of procedures carried out on the brain and the nervous system.
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15
How can auxins be used to kill weeds?
Most weeds growing in a field of crops or on a lawn are broad leaved, in contrast to grasses and cereals which are narrow leaves. Selective weedkiller...
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15
What is reaction time affected by?
Age, drugs e.g. caffeine or gender
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15
What is a motor neurone?
Neurones that carry information from the CNS to the effectors.
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15
Name three barrier methods, non hormonal methods of contraception.
Male and female condom, diaphragm, spermicide
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15
What is the sclera?
The tough supporting wall of the eye
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15
Why is the iris reflex needed?
To prevent light from damaging the retina.
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15
What is the retina?
Contains receptor cells called rods and cones. These are sensitive to colour and light intensity.
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15
What do the receptors do?
Detect the stimulus or change in environment.
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15
Explain the iris reflex in very bright light.
In very bright light a reflex is triggered to make the pupil smaller. The CIRCULAR muscles CONTRACT and the RADIAL muscles RELAX.
