Types of Nerve Cells
Neurons areofthree types onthe basis of functions.
Sensory Nerves:
- Nerves that receive nerve impulse from the receptor cells found in different sense organs of our body that receive sensory information from external environment and carry it to central nervous system i.e. brain and spinal cord. If a person looks at an object, the function of carrying information of that object to brain is done by sensory nerves. These nerves are also called afferent neurons.
Motor Nerves:
- Nerves that carry instructions, information and decisions received from brain and spinal cord to appropriate places: to organs, muscles, glands are called motor nerves for e.g. if a person looks at an object and then the brain’s decision to touch that object is carried to muscles of hands by motor nerves. These types of nerves are also called efferent nerves.
Association Nerves:
- These nerves are found only in brain and spinal cord and establish association or connection between sensory and motor nerves.
These three types of nerves work in a synchronized manner so that a person can respond to a stimulus.
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Important Points of Human Behavior :-
- “Inthis chapter, the relation of human behavior and biology is described.”
- The cell is the basic unit of human body. Many cells form tissue, many tissue to organ, many organs to organ systems are formed. These organ systems perform specific functions of our body. Nerve cell is the basic and smallest unit of nervous system. It is also called neuron.
- Nerve cells are of three types on the basis of functions: Sensory, motor and association neurons.
- Nerve cells perform the function of transmitting information in our body.
- Nervous system is of two types: Central Nervous System and Peripheral Nervous System.
- Central Nervous system consists of brain and spinal cord.
- Peripheral nervous system is divided in two parts somatic nervous system and autonomic nervous system.
Human Behavior Questions and Answers
1. Which part of nerve cell contains nucleus?
A Axon
B. Soma
C. Myelin Sheath
D. Nodes of Ranvier
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Answer :- ( B )
2. Which part of nerve cell increases the speed of nerve conduction?
A Myelin Sheath
B. Dendrites
C. Thalamus
D. Pons
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Answer :- ( A )
“3. Which part of brain controls activities like eating, drinking, sleeping, temperature regulation and sexual arousal?”
A Pons
B. Cerebellum
C. Hypothalamus
D. Thalamus
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Answer :- ( C )
4. How many pairs of cranial nerves are there in human brain?
A. 6
B. 10
C. 12
D. 31
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Answer :- ( C )