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Question
Write a note on:
Nerve cell
Solution
Special types of cells which conduct impulses from one place to another in the body are called neurons. Neurons are the structural and functional units of the nervous system. Nerve cells, the largest cells in the human body, may measure up to a few metres in length. Nerve cells have the ability to generate and conduct electrochemical impulses. All the information about our surroundings is collected by the ends or dendrites of the neuron. The chemical process begins at those ends and electric impulses are generated which are conducted from the dendrites to the cell body, from the cell body to the axon and from the axon to its terminal. These impulses are then to be transferred from this nerve cell to the next. The cells that support the nerve cells and help in their functioning are called neuroglia. Nerve cells and neuroglial cells together form the nerves.
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The milk was on the stove. Rasika was engrossed in watching television. She smelled something burning. She ran towards the kitchen. The milk was boiling over. She held the vessel with her bare hands but, screaming, she let it go at once. This activity was controlled by ______ cells. Special ends of ______ in these cells collected the information, from where it was transferred to the ______ and then towards the terminal end of the ______ The chemicals produced at the terminal end passed through the minute space i.e. ______ In this way, ______ were conducted in the body and the process of ______ was completed by conducting the impulses from ______ to ______.
(Nerve, muscle cell, impulse, dendrite, synapse, axon, reflex action, cell body)
