Question

1
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.

Answer 1

(a) A- neurons  

(b) i. B- axon

    ii. C- dendrites

(c) D- synapse

(d) a neuron transmitts messages to and from the central nervous system. it is the structural and funtional unit of the nervous system.

(e) sensory,motor and relay neurons