Anatomy and Physiology of Animals/The Senses/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.
 * optic nerve | choroid | cornea | aqueous humor | retina | cones | iris | vitreous humour | sclera | lens
 * 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.


 * pinna | Eustachian tube | cochlea | tympanic membrane | external ear canal | ear ossicles | semicircular canals



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.