The Senses

Question 1

Give a function of the eyelids

Answer 1

Can cover and protect the eyes

Question 2

Give a description of the conjunctiva

Answer 2

Thin transparent lining protecting the cornea from infection

Question 3

Give a description of the cornea

Answer 3

Front transparent part of the sclera. Focuses light rays on the retina

Question 4

Give a description of the sclera

Answer 4

Tough fibrous outer layer, the ‘white’ of the eye, maintains shape of eyeball

Question 5

Give a description of the choroid

Answer 5

Contains blood vessels supplying food and oxygen to the cells of the eye

Question 6

Give a description of the retina

Answer 6

Innermost layer of the eye that contains receptor cells

Question 7

What are the different types of receptor cells in the eye, and what do they detect

Answer 7

Rods = black and white
Cones = colours

Question 8

Give a description of the optic nerve

Answer 8

Carries impulses from the receptor cells to the cerebrum

Question 9

Give a description of the aqueous humor

Answer 9

A salt solution that holds the front of the eye in shape

Question 10

Give a description of the vitreous humor

Answer 10

Supports the eye by excepting an outward pressure on the eyeball

Question 11

Give a description of the fovea

Answer 11

Area at the back of the eye where our best vision is (only cones)

Question 12

What are some advantages of having 2 eyes

Answer 12

1. Depth perception
2. 3D vision

Question 13

Give a description of the iris

Answer 13

Contains blood vessels and melanin and controls the amount of light entering the eye

Question 14

What happens to the pupil in bright and dim lights

Answer 14

Bright = constricts
Dim = dialates

Question 15

Give a description of the pupil

Answer 15

The black circle in the front of the eye, let’s light into the eye

Question 16

Give a description of the ciliary muscle/body

Answer 16

Thickened edge of the choroid that controls the shape of the lens

Question 17

Give a description of the lens

Answer 17

Focuses the light rays on the retina

Question 18

Give a description of the suspensory ligament

Answer 18

Holds the lens in place

Question 19

Give a description of the blind spot

Answer 19

Where the optic nerve leaves the retina, no receptor cells

Question 20

Give a description of the pinna

Answer 20

Outer visible ear that funnels sound into the ear canal

Question 21

Give a description of the auditory canal

Answer 21

Carries vibrations to the eardrum, has hairs and wax glands to trap dirt

Question 22

Give a description of the eardrum

Answer 22

Vibrates when sound waves hit it, carrying sound into middle ear

Question 23

Give a description of the ossicles

Answer 23

3 small bones [Hammer, anvil stirrup] that amplify sound and pass them on to the cochlea in the inner ear

Question 24

Give a description of the eustachian tube

Answer 24

Keeps air pressure on each side of the ear drum, connected to pharynx

Question 25

Give a description of the semi-circular canals

Answer 25

Help us keep our balance and posture

Question 26

Give a description of the cochlea

Answer 26

Responsible for hearing, converts vibrations into electrical impulses that are sent to the brain along the auditory nerve

Question 27

Give a description of the organ of corti

Answer 27

In the cochlea and contains receptor cells that allow hearing