Give four examples of simple human reflexes.

Explanation

(i) Knee-jerk reflex in which the leg is involuntarily forward as a result of a sharp tap below the hee-cap in a relaxed (freely hanging) leg.
(ii) Closing of the eyelids when an object suddenly the eye or when a strong beam of light is flashed cross.
(iii) Withdrawal of the hand on pricking a pin or a corn.
(iv) Movement of the diaphragm.