What are the limitations of the nervous system in the human body?
I. The electrical impulses reach only those cells that are connected by the nervous tissue and not each and every cell of the body.
II. Cells cannot continuously create and transmit electrical impulses, once an electrical impulse is generated and transmitted, the cell will take some time to reset its mechanism and create a new electrical impulse.

Q. Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

Q.

Which of the following generally transmit nerve impulse only to the cyton/cell body?

Q. Axon transmits impulse ________ cell body and dendrites transmit impulse ________ cell body.

Q. 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.​
(b) What is the name of (i) branch B, and (ii) branches C?​

Q. (a) Draw the structure of a neuron and label the following on it:
Nucleus, Dendrite, Cell body and Axon
(b) Name the part of neuron:
(i) where information is acquired.
​(ii) through which information travels as an electrical impulse.