Movement in organisms
The ability of organisms to move certain body parts is movement. When they move from one place to another, it is called locomotion.
Receptors
Receptors are the specialized tips of the nerve fibres that collect the information to be conducted by the nerves. Receptors are in the sense organs of the animals.
They are classified as follows :
-
Phono-receptors: These are present in inner ear. The main functions are hearing and balance of the body.
-
Photo-receptors: These are present in the eye. These are responsible for visual stimulus.
-
Thermo-receptors: These are present in skin. These receptors are responsible for pain, touch and heat stimuli. These receptors are also known as thermoreceptors.
-
Olfactory-receptors: These are present in nose. These receptors receive smell.
- Gustatory-receptors: These are present in the tongue. These helps in taste detection.
The topics discussed in this chapter are as follows:
- The Nervous System
- Reflex action
- Protection of brain
- Plant hormones and movements
- Endocrine System