Question

State one main functions of each of the following:

(i) Cerebellum, (ii) Iris, (iii) Eustachian tube

Answer 1

• The cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain and then regulates motor movements.
  
• The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris.
  
• Eustachian tube controls the pressure within the middle ear, making it equal with the air pressure outside the body.