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what is the cerebral cortex function
responsible for consciousness, intelligence, memory and language
what is the function of the cerebellum
coordinates movement and balance
what is the function of the medulla
controls automatic actions such as heart beat and breathing
how can you study the brain
studying patients with brain damage
electrically stimulating different parts of the brain
using MRI scanning techniques
what is the function of the retina
contains receptor cells that are sensitive to the brightness and colour of light
what is the function of the optic nerve
carries impulses from the retina to the brain
what is the function of the sclera
forms a tough outer layer
what is the function of the iris
control the size of the pupil and the amount of light reaching the retina
what is the function of the ciliary muscles and suspensory ligaments
change the shape of the lens to focus light onto the retina
what is accommodation
the process of changing the shape of the lens to focus on near or distant objects
what happens for the eye to focus on a near object
ciliary muscles contract
suspensory ligaments loosen
lens become thicker and refracts light rays strongly
what happens for the eye to focus on a distant object
ciliary muscles relax
suspensory ligaments are pulled tight
lens is pulled thin and only slightly refracts light rays
what is short sightedness also known as`
myopia
what is long sightedness also known as
hyperopia
what do spectacle lenses do
refract the light rays so that they focus on the retina
what happens to the eye in dim light
radial muscles of the iris contract
circular muscles of the iris relax
the pupil is dilated to let more light in
what happens to the eye in bright light
radial muscles of iris relaxed
circular muscles of iris contracted
constricted pupil so that less light enters the eye
Note 
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