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प्रश्न
How are the messages carried across a synapse? Explain with the help of a labelled diagram.
उत्तर
A receptor in a sense organ is in touch with the dendrites of the sensory neuron. When a stimulus acts on the receptor, a chemical reaction is initiated that produces an electrical impulse in the receptor. This impulse travels from the dendrites of the sensory neuron (say A) to its cell body and, then, along its axon. At the end of the axon of the sensory neuron A, the electrical impulse releases chemical substances called neurotransmitters into the synapse which cross the synapse and start a similar electrical impulse in the dendrites of the next neuron (say B). From the dendrites, this electrical impulse is carried to the cell body and, then, to the axon of the second neuron.
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संबंधित प्रश्न
What is the need for a system of control and coordination in an organism?
Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.
Draw a labelled diagram of a neuron.
Multiple choice question. Tick (✓) the correct choice:
Nervous system in humans consists of
- brain and nerves
- brain and spinal cord
- brain, spinal cord and nerves
- none of the above
Name the following:
Five sense organs of human beings and the sensation perceived by each one.
Explain the term: sensory nerve.
Give Technical Term:
The chemical messenger by which the nerve impulse travels from one neuron to the other.
Give Technical Term:
The receptors which help in the sensation of taste.
Choose the Odd One Out:
The human nervous system is divided into ______ parts.
