eyes key terms

Question 1

what is a conjuctivia?

Answer 1

conjuctivia is a thin membrane which covers the cornea

Question 2

what is the function of conjuctivia?

Answer 2

to protect the eyeball

Question 3

what is a cornea?

Answer 3

cornea is the front part of the scelera

Question 4

what is the function of the cornea?

Answer 4

cornea allows the passage of light while refracting it.

Question 5

what is scelera?

Answer 5

its a tough connective tissue

Question 6

what is the function of the scelera?

Answer 6

it provides protection against mechanical damage, it also allows attacthemnt of muscle tissues.

Question 7

what is a iris?

Answer 7

it is the coloured part of the eye, which contains the radial and circular muscles.

Question 8

what is the function of iris?

Answer 8

to adjust the amount of light entering the eye, by controlling the size of the pupil.

Question 9

what is a pupil?

Answer 9

its a gap between the iris.

Question 10

what is the function of the pupil?

Answer 10

allows light to go through. its size can be varied.

Question 11

what is the aqueous humour?

Answer 11

it is transparent watery liquid which is found at the front part of the eye.

Question 12

what is the function of the aqueous humour?

Answer 12

maintain the shape of the chamber part of the eye.

Question 13

what is a lens?

Answer 13

transparent and elastic ovoid(biconcave). held in place behind the cornea.

Question 14

what is the function of the lens?

Answer 14

changes shape to adjust the accomodation of light onto the retina.

Question 15

what is the suspensory liagements?

Answer 15

liagements which connect the cilary body to the lens.

Question 16

what is the function of suspensory liagment?

Answer 16

to transfer the tension of the wall of eyeball to the lens, to make lens thinner.

Question 17

what is the viterous humour?

Answer 17

transparent, jelly like material filling the rear part of the eyeball.

Question 18

what is the function of the viterous humour?

Answer 18

maintain the shape of the rear part of the eye, and provides support for the lens.

Question 19

what is the retina?

Answer 19

retina contains light senstive cels.

Question 20

what is the function of the retina?

Answer 20

the light sensitve cells(rods and cones) can intiated impulses when stimulated approaitely.

Question 21

what is a fovea?

Answer 21

fovea at the back of the retina, rich in cones.

Question 22

what is the function of the fovea?

Answer 22

to provide high visual acuity and colour vision.

Question 23

what is choroid?

Answer 23

is a pigment , behind the eyeball, behind the retina which is rich in cones

Question 24

what is the function of the choroid?

Answer 24

contain blood vessels to retina, which prevent light reflection to eyeball.

Question 25

what is optic nerve?

Answer 25

a bundle of sensory fibre which leaves the back of the eyes.

Question 26

what is the function of the optic nerve?

Answer 26

transmit impulses from the retina to the back of the brain.

Question 27

what is the blind spot?

Answer 27

region where optic nerve leaves inside of eyeball and so contains no light sensitive cells.

Question 28

what is the function of the blind spot?

Answer 28

a region which if light strikes it , it is not sensitive to light.