Question

Give the main functions of each of the following:
(i) Cochlea
(ii) Fovea centralis
(iii) Three semicircular canals
(iv) Retina
(v) Lachrymal glands

Answer 1

(i) The cochlea is a spiral canal 35 mm long and is a part of the inner ear. Here, sound waves are converted into electrical impulses. These electric impulses are then carried on to the brain, which then helps us to hear sounds.

(ii) The fovea centralis is the place of the eye's most distinct vision. It has only cone cells and is devoid of rod cells.

(iii) The main function of the semi-circular canals is to provide sensory inputs for experiences of rotary movements. It is also the organ that provides the sense of balance.

(iv) The main function of the retina is to capture light rays and convert them into electrical impulses, which are eventually turned into images that the brain can interpret.

(v) The main function of the lachrymal gland is to produce tears, which moisten the surface of the eye, lubricate the eyelid and wash away foreign bodies.