INTRODUCTION TO CONTROL AND COORDINATION.

Stimulus
Any major or minor change in environment.

Receptor
Cell, tissue or organ sensitive to stimulus

In all animals control is achieved through

1. Neural System
2. Endocrine System

Difference between the two are as follows:

1. Nervous system is made up of nerve cells while endocrine system is made up of secretory cells.
2. Messages are transmitted in the form of electrical impulses in nervous control while these are transmitted as chemicals in hormonal control.
3. Impulses travel rapidly while hormone action is slow.
4. Effect of nerve impulse lasts for a short duration of time while effect of hormone lasts longer.
5. Impulses are transmitted along the nerve fibre while hormones are transmitted via bloo