Estimated Daily Requirement & EAR=0.6 x body mass (kg)
1 of 16
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.
2 of 16
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.
3 of 16
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.
4 of 16
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.
5 of 16
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.
6 of 16
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.
7 of 16
To look at close objects the?..
Ciliary muscle contracts, suspensory ligament slackens, lens is more rounded so light is refracted more.
8 of 16
To look at distant objects the?..
Ciliary muscles relaxes, suspensory ligament pulls tight, lens is narrow and thin so less light refracted?
9 of 16
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.
10 of 16
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.
11 of 16
What is red/green colour blindness?
Lack of receptors in retina - can't distinguish between red and green.
12 of 16
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.
13 of 16
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.
Vessels dilate. Decrease sweating. Increase metabolic rate. Hairs stand on end. Shivering.
16 of 16
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
Card 4
Front
Give 2 description points of the Iris and the function of it?
Back
Card 5
Front
Give 2 description points of the Lens and the function of it?
Comments
No comments have yet been made