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प्रश्न
Explain the Term: Nerve
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उत्तर
A nerve is a thread-like structure which emerges from the brain and the spinal cord. It consists of a large number of axons or nerve fibres surrounded by a connective tissue sheath. The nerves arising from the brain are called cranial nerves while those arising from the spinal cord, are called spinal nerves.
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संबंधित प्रश्न
Which parts of the body form the central nervous system?
Name the three types of nerves which constitute the peripheral nervous system.
The number of pairs of nerves which arises from the spinal cord is:
The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.
Define the following:
Action potential
Draw a well-labeled diagram of a Neuron.
State the Location of:
Pinnae
Choose the Odd One Out:
Complete the following sentence with appropriate Word
The ventral root ganglion of the spinal cord contains cell bodies of the:
Long answer question
Krishna was going to school and on the way, he saw a major bus accident. His heartbeat increased and hands and feet become cold. Name the part of the nervous system that had a role to play in this reaction.
