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प्रश्न
How nerve impulses are transferred from one neuron to the next neuron?
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उत्तर
All the information from the environment is detected by the receptors, located in the sense organs such as the eyes, nose, skin and etc. Information from the receptors is transmitted as an electrical impulse and is received by the dendritic tips of the neuron. This impulse travels from the dendrite to the cell body and then along the axon to its terminal end. On reaching the axonal end, it causes the nerve endings to release a chemical (neurotransmitter) that diffuses across a synapse and starts a similar electrical impulse in the dendrites of the next neuron, then to their cell body to be carried along the axon.
The electrical signal reaches the brain or spinal cord. The response from the brain (or spinal cord) is similarly passed on to the effector organs such as the muscle or gland cell, that undergoes the desired response.
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संबंधित प्रश्न
Differentiate between Myelinated and non-myelinated axons.
What are the advantages of having a nervous system?
Name the following:
Neuron only with axon.
Differentiate between:
A Sensory neuron and a Motor neuron (function)
Dendrons are the longest fibres that conduct impulses away from the cell body.
Identify the parts of a neuron which help the nerve impulse to travel towards the cell body.
Write one word for the following:
Long thread-like part of the nerve cell.
Any factor that can bring a change in the body of an organism is called ______.
Give reason:
Neurotransmitters are broken down by an enzyme just after passing an impulse from one neuron to the other.
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
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- Write the technical term for the diagram.
- Name two organs of our nervous system where these cells are richly found.
- How are these cells significant for us?
- Name the cell organelle that is absent in these cells and how does it affect our body metabolism?
- Redraw the same figure and label the following Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.
