• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar

Class Notes

  • Home
  • Class 1-5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12
  • NCERT Solutions
Home » Class 10 » Control and coordination » Control and Coordination-Nervous System

Control and Coordination-Nervous System

Last Updated on February 16, 2023 By Mrs Shilpi Nagpal

Question 1 Define the term stimuli?

Question 2 Define the term coordination?

Question 3 What are neurons?

Question 4 Explain the structure of neuron?

Question 5 What is the function of nervous system?

Question 6 What is synapses?

Contents

  • 1 Control and coordination
    • 1.1 Nervous System
    • 1.2 Structure of Neuron

Control and coordination

The change in environment to which organism respond and react is called stimuli.

The environmental factors such as heat, light, cold, touch, taste, smell, force of gravity etc. act as a stimuli to induce response and reaction in living organism.

The working together of different organs of a body of an organism in a proper manner to produce proper reaction to a stimulus is called coordination.

For proper control and coordination there are 2 systems:

1) Nervous System
2) Endocrine system

Nervous System

The nervous system is composed of specialised cells called neurons which exercise control by sending electrical signals called nerve impulses.

Nerve cell or neurons are the structural and functional unit of nervous system.

Structure of Neuron

Structure of neuron

1) Cell Body : The cell body is also called as cyton. It has abundant cytoplasm called neuroplasm and spherical nucleus, mitochondria, neurotubules, neurofibrils.

2) Dendrites : There are several short branches stretching out from cell body. They conduct nerve impulses towards cell body.

3) Axon : It is a single, very long cylindrical fibre arising from cell body. They conduct nerve impulses away from cell body. They have an insulating and protective sheath of myelin around it.

The neurons lie end-to-end in chains to transmit nerve impulses. Each neuron receives an impulse through its dendrites and passes it on the next neuron in the chain through axon via cell body.

There occurs a very minute gap between terminal portion of axon of one neuron and dendrite of other neuron. This gap is called synapse. The synapse act as a one-way valve to conduct impulse in one direction only. This is because a chemical substance called neurotransmitter is secreted only on one side of gap ie axon’s side.

Share with Friends

Filed Under: Class 10, Control and coordination Tagged With: axon, cell body, coordination, cyton, dendrites, nerve cell, nerve impulse, nervous System, neuron, neuroplasm, stimuli, synapse

Primary Sidebar

Recent Posts

  • Comet – I, Class 8 English, Chapter 9 Notes
  • Essay on Holi for Kids and Students
  • Jalebis, Class 8 English, Chapter 8 Notes
  • The Open Window, Class 8 English, Chapter 7 Notes
  • The Fight, Class 8 English, Chapter 6 Notes
  • Facebook
  • Pinterest
  • Twitter
  • YouTube

© 2016 - 2023 · Disclaimer · Privacy Policy · About Us · Contact Us