Question

important things in chapter control and coordination(10thclass)

Answer 1

Brain and it's parts, and nervous system and endocrine system

Answer 2

All the living organisms respond and react to changes in the environment around them.
• The changes in the environment to which the organisms respond and react are called stimuli such as light, heat, cold, sound, smell, touch etc.
• Both plants and animals respond to stimuli but in a different manner. Control and Coordination in Animals It is brought about in all animals with the help of two main systems :
(a) Nervous system
(b) Endocrine system

NERVOUS SYSTEM

• Control and coordination are provided by nervous and muscular tissues.
• Nervous tissue is made up of an organized network of nerve cells or neurons, and is specialized for conducting information via electrical impulses from one part of the body to another.

Receptors:

Are specialized tips of some nerve cells that detect the information from the environment. These receptors are located in our sense organs.
(a) Ear : • Phonoreceptors
• Hearing
• Balance of the body
(b) Eyes • Photoreceptors
• Seeing
(c) Skin : • Thermoreceptors
• Heat or cold
• Touch
(d) Nose : • Olfactory receptors
• Smell detection
(e) Tongue : • Gustatory receptors
• Taste detection

Neuron :  It is the structural and functional unit of nervous system.



Parts of Neuron :

(a) Dendrite : Acquires information.
(b) Cell body : Acquired information travels as an electrical impulse.
(c) Axon : Longest fibre on the cell body is called axon. It transmits electrical impulse from cell body to dendrite of next neuron.
Synapse :It is the gap between the nerve ending of one neuron and dendrite of the other neuron. Here electrical signal is converted into chemical signal for onward transmission.