Page 1 - Microsoft Word - Nerves and Reflex action

CHAPTER-9 NERVOUS SYSTEM
Topic: Nerves and Reflex action

Nerves

 A nerve is a cable-like structure within the body designed to conduct nerve impulses that
relay information from one part of the body to another.
 A typical nerve is made up of a bundle of fibres which are wrapped around layers of tissue
and fat, and they stretch throughout the body. These nerves transmit information to and
from the respective organs.
 Nerves are a part of the nervous system.
 They are primarily involved in control and the coordination of all the parts of the body.

Types of Nerves

There are three types of nerves in the human body which are classified based on their functions.
These are the sensory nerves, motor nerves and mixed nerves.

 Sensory Nerves

These are the nerves that send messages to the brain or the
spinal cord from the sense organs. These are enclosed in the
form of a bundle like structures or nerve fibres in our whole
body.

 Motor Nerves
Motor nerves are those nerves those that carry the messages
in the form of a response from the brain or the spinal cord to
other parts of the body such as the muscles and glands.
 Mixed Nerves

Mixed nerves are the nerves that perform both the action of sensory nerves as well as a motor
nerve. They transform information from brain to other parts and vice versa. Generally, the mixed
nerves transmit impulses at the rate of 120 metres per second or 432 kilometres per hour.

https://byjus.com/biology/nerves/