chapter 27 sensory systems Flashcards
1
Q
what are the three layers of the eyeball
A
sclera [outer layer]
choroid [middle layer]
retina [inner layer ]
2
Q
what is the function of the lens of the eye
A
to sharpen the focus of the light rays on the retina
3
Q
where are the rods and cones located in the eye & what is their function
A
rods–»120 million rods; sensitive to light, but do not distinguish color, enable night vision located in the retina
cones–»provide color vision, function in daylight, and contribute very little to night vision located in the retina
4
Q
what are the two functions of the ear
A
hearing and equilibrium
5
Q
what is the function of the eustachian tube
A
prevents the membrane from rupturing as a result of changes in air pressure
6
Q
what is the function of the cochlea
A
hearing
