notes on nervous system?
Answers
Explanation:
system is based on stimulus-response.
- stimulus: any change in an organism's environment.
- response: the action or reaction of an organism as a result of a change in its environment.
Nervous system: specialized cells, tissues and organs that allow organisms to detect changes in the environment and respond to those changes.
- the nervous system delivers electrochemical messages called impulses.
- impulses are primarily electrical in nature.
- impulses can only move in one direction along a neuron: from cell body to axon.
- the nature of all impulses is the same. What makes one impulse different from another impulse is the number of neurons being stimulated, and the part of the brain receiving the impulse.
Neuron: a nerve cell.
Nerve: a bundle of neurons originating from the same location.
+ ) The network of Nerve cells and fibres which transmits nerve impulses b/w the part of body is known as nervous system .
+ ) The Nervous System mainly consists of three main organs , they are :-
( 1 ) Brain .
( 2 ) Spinal cord .
( 3 ) Sensory organs .
+ ) There are mainly three types of nerves , they are :-
( 1 ) Autonomic nerves .
( 2 ) Motor nerves .
( 3 ) Sensory nerves .