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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.
(a) Cells A are neurons or nerve cells. (b) (i) The name of branch B is the axon. (ii) The name of branches C are the dendrites. (c) The microscopic gap D is known as a synapse. (d) Cell A or Neurons transmits the electric signal or impulse to and from the central nervous system. It is the structural and functional unit of the nervous system. (e) Cell A or Neurons are of three types- 1. Sensory neurons 2. Motor neurons. 3. Relay neurons.
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