A sharp tap is given at your knee cap with rubber hammer. You suddenly stretch your leg.
a) Give name of this response.
b) Which nerve centre is involved in this action ?
c) Construct a flow chart of the pathway of impulses in this action.

Suppose you dramatically escaped from a motor accident. Your heart beat and rate of respiration was increased at that moment. a) Name the hormone involved in this change. b) Which part of nervous system control these action? c) Enlist other physiological changes that you may feel at that time.

Given below are the stages in the generation of optic nerve impulse or action potential on the retina and the role of opsin and retinal in the mechanism of vision. Arrange them in a sequential order. a) Action potential (impulses) are transmitted by the optic nerves to the visual cortex area of the brain. b) Light induces dissociation of retinal from opsin. c) Generates action potential in the ganglion cells through bipolar cells. d) Structural changes in the opsin which induce membrane permeability changes. e) Potential differences are generated in the photoreceptor cells. f) Neural impulses are analyzed by visual cortex area of the brain.