eye parts- function & desciption

Question 1

Cornea- description

Answer 1

tough transparent converging the front of the eye. Convex in shape

Question 2

Cornea- function

Answer 2

refracts light as it enters the eye (by a fixed amount)

Question 3

Iris- description

Answer 3

colours part of the eye that contains muscles. these relax and contract to adjust the size of the pupil

Question 4

Iris- function

Answer 4

controls how much light enters the pupil

Question 5

pupil- description

Answer 5

hole in the middle of the iris

Question 6

pupil- function

Answer 6

allows light to pass through as it enters the eye

Question 7

lens- description

Answer 7

transparent, bi-convex, flexible disc behind the iris. it is attached to the ciliary muscles by the suspensory lens

Question 8

lens- function

Answer 8

refracts light to focus it onto the retina. the amount of refraction can be adjusted by altering the thickness and curvature of the lens

Question 9

ciliary muscles- description

Answer 9

muscles connected to the lens by suspensory ligament

Question 10

ciliary muscles- function

Answer 10

adjust the shape of the lens to make it more or less curved, so as to increase or decrease the refraction of light

Question 11

retina- description

Answer 11

the lining of the back of the eye, containing 2 types of light receptors: cones and rods

Question 12

what are the function of rods, in the retina?

Answer 12

sensitive to dim light and black and white

Question 13

what are the function of cones, in the retina?

Answer 13

sensitive to colour

Question 14

retina- function

Answer 14

contains the light receptors, which trigger electrical impulses to be sent to the brain when light is detected

Question 15

suspensory ligaments- description

Answer 15

connect the ciliary muscles to the lens, and hold the lens in place

Question 16

suspensory ligaments- function

Answer 16

slacken or stretch as the ciliary muscles contract or release, to adjust the thickness and curvature of the lens