Homeostasis - class 11 cbse

9/24/2015 CBSE


Homeostasis



Definition




Home means same and statis means state. So the regulatory mechanism which
maintained the internal environment of
a organism is called homeostatis.



Important Aspects of Homeostatis




There are three important aspects of homeostatis.


  • Osmoregulation

  • Thermoregulation

  • Excretion





Feed Back System




The check and balance system in a body
is called feed back system. In a feed back system three organs are involved.




1. Receptor

The organ which receive any change in the internal environment of the body are
called Receptor.

2. Effector

The central nervous system which send
the message to a particular organ are
called effector. Take part in particular action.

3. Central Nervous System

The receptor transfer message to a central nervous system such as brain.





Types of Feed Back System



There are two type of feed back system.



  • Positive Feed Back System

  • Negative Feed Back System



1. Positive Feed Back System

When there is a change in the internal environment and it is further increase
by the process are called positive feed back system.

2. Negative Feed Back System

When there is a change in the internal environment and it is further decreased
by the process called negative feed back system.





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