Question

Question 2 Compare the following:

(a) Central neural system (CNS) and Peripheral neural system (PNS)

(b) Resting potential and action potential

(c) Choroid and retina

Class - XI - Biology Chapter Neural Control and Coordination Page No. 328

Answer 1

(a) Central neural system (CNS) and Peripheral neural system (PNS)

Central neural system (CNS)Peripheral neural system (PNS)It is the main coordinating centre of the body.It is not the main coordinating centre of the body.It lies inside the skull.It does not lie inside the skull.This includes brain and spinal cord.This includes all the nerves of the body associated with the CNS (brain and spinal cord).
(b) Resting potential and action potential

Resting potential

Action potential

It is the potential difference across the nerve fibre when there is no conduction of nerve impulse.It is the potential difference across nerve fibre when there is conduction of nerve impulse.The interior of the neuron is electronegative and the exterior is electropositive.The interior of the neuron is electropositive and the exterior is electronegative.An active sodium pump operates.No sodium pump operates.
(c) Choroid and retina

ChoroidRetinaChoroid is the middle vascular layer of eye.Retina is the innermost nervous coat of eye.It is rich in blood cellsIt is rich in neuronsIts function is to supply nutrients and oxygen to other parts of eye like retinaIts function is to form an image of an object over it.