What is meant by stimulus and reaction?
Stimulus is the change in the environment or environmental factors to to which the organism can respond or react. Theresponse shown by organisms towards or awaya stimulus is called reaction.
Name the main part of hind brain. Also write down the main function of any two of them.
The main part of hind brain are:
a. Cerebellum:
- It maintain equibirium and controls posture.
- It makes body movt. smooth, steady and coordinated.
- It regulates and coordinates voluntary muscles.
b. Pons varolii:
- It serves as relay station carrying signal from the cerebrum to cerebellum.
- It regulates respiration.
c. Medulla Oblongata:
- It controls breathing, blood pressure and heart beat.
- It controls contraction and relaxation of blood vessels.