Describe the Nervous System in animals.
Answers
It is the network of nervous organs, nerves and neurons that controls and coordinates body activities with the help of electrical impulses produced in response to internal and external stimuli.Stimulus is an agent, factor, chemical or change in externalor internal environment which brings about a reaction in the organism.Response is the reaction of the organism to a stimulus. For perceiving stimuli and providing response , the nervous system requires receptors and effectors.Receptors are cells, tissues and organs which are capable of receiving particular stimuli and initiate impulses to be picked up by sensory nerves. Impulse is self propagated electrical current that runs along the surface of the nerve fibre forpassage of information.Effectors are muscles, glands, tissues or cells which act in response to a message received from the nervous system..