The Senses Test Yourself Answers

1. Where are the organs that sense pain, pressure and temperature found?

The organs that sense pain, pressure and temperature are found in the dermis of the skin.

2. Which sense organ responds to chemicals in the air?

The olfactory organ in the nose responds to chemicals in the air.

3. Match the words in the list below with the following descriptions.

a) Focuses light rays on the retina - Lens

b) Respond to colour and detail - Cones

c) Outer coat of the eyeball - Sclera

d) Carries nerve impulses from the retina to the brain - Optic nerve

e) The chamber behind the lens is filled with this - Vitreous humour

f) This layer of the eyeball reflects light in nocturnal animals like the cat - Choroid

g) This is the transparent window at the front of the eye. Cornea

h) This constricts in bright light to reduce the amount of light entering the eye - Iris

i) The light rays are focused on here by the lens and cornea - Retina

j) The chamber in front of the lens is filled with this - Aqueous humour

4. Add the following labels to the diagram of the ear below.

Diagram of the ear with labels added

5. What is the role of the Eustachian tube?

The Eustachian tube equalises air pressure on either side of the tympanic membrane.

6. What do the ear ossicles do?

The ear ossicles transmit vibrations across the middle ear to the inner ear.

7. What is the role of the semicircular canals?

The semicircular canals respond to movement of the head including acceleration and

slowing down.

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