B1 MOCK EXAM

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Give the definition of EAR & the equation?
Estimated Daily Requirement & EAR=0.6 x body mass (kg)
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What is a double blind trial?
Some patients are given the drug wilst others are given a placebo. A placebo is designed to appear exactly the same as the drug itself, but it does not actually contain any of the drug.
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Give 2 description points of the Cornea and the function of it?
Front part of the tough outer coat, the sclera. It is covex and transparent. It refracts light - bends it as it enters the eye.
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Give 2 description points of the Iris and the function of it?
Pigmented - decides the colour of your eyes - so light cannot pass through. It's muscles contract and relax to alter the size of its central hole or pupil. Controls how much light enters the pupil.
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Give 2 description points of the Lens and the function of it?
Transparents, bi-convex, flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles. It focuses light onto the retina.
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Give 2 description points of the Retina and the function of it?
The lining of the back of eye containing two types of photoreceptor cells - rods - sensitive to dim light and black and white, cones - sensitive to colour. A small area called the fovea in the middle of the retina has many more cones than rods.
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Give a description point of the Optic Nerve and the function of it?
Bundle of sensory neurones at back of eye. Carries impulses from the eye to the brain.
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To look at close objects the?..
Ciliary muscle contracts, suspensory ligament slackens, lens is more rounded so light is refracted more.
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To look at distant objects the?..
Ciliary muscles relaxes, suspensory ligament pulls tight, lens is narrow and thin so less light refracted?
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What is binocular vision?
The eyes sit side by side, each eye captures a slightly different view so when they are processed we get a 3D picture and are able to judge distances well.
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What is monocular vision & give an example of an animal that has this?
The eyes are on either side of the head. Great field of view, useful for spotting predators. However, poor depth perception.
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What is red/green colour blindness?
Lack of receptors in retina - can't distinguish between red and green.
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Short-sight means?
Someone can see near objects clearly, but can't focus properly on distant objects. The eyeball is elongated which can be corrected with a concave lens.
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Long-sight means?
Someone can see distant objects clearly, but can't focus properly on near objects, Lens focuses the sharpest image behind the retina instead of on it, often age-ted and due to loss of elasticity in the lens. Corrected by convex lens in front of eye.
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Describe what happens during vasodilation?
Vessels constrict. Increase sweating. Decrease metabolic rate. Hairs lie flat.
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Describe what happens during vasoconstriction?
Vessels dilate. Decrease sweating. Increase metabolic rate. Hairs stand on end. Shivering.
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Other cards in this set

Card 2

Front

What is a double blind trial?

Back

Some patients are given the drug wilst others are given a placebo. A placebo is designed to appear exactly the same as the drug itself, but it does not actually contain any of the drug.

Card 3

Front

Give 2 description points of the Cornea and the function of it?

Back

Preview of the front of card 3

Card 4

Front

Give 2 description points of the Iris and the function of it?

Back

Preview of the front of card 4

Card 5

Front

Give 2 description points of the Lens and the function of it?

Back

Preview of the front of card 5
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