Q45 of 61 Page 64

Draw the structure of a neuron and explain its function.

Neurons are nerve cells which are the functional units of the nervous system. The three main parts of a neuron are dendrite, cell body and axon.

Dendrite: It detect information and conducts the messages towards the cell body.

Cell body: It contains nucleus, mitochondria, and other cell organelles. It maintains the growth of the cell.

Axon: It conducts messages away from the cell body and pass to the next neuron.

Answer the following:

(a) Which hormone is responsible for the changes noticed in females at puberty?

(b) Dwarfism results due to deficiency of which hormone?

(d) Iodine is necessary for the synthesis of which hormone?

(e) Name the endocrine gland associated with brain?

(f) Which gland secretes digestive enzymes as well as hormones?

(g) Name the endocrine gland associated with kidneys?

(h) Which endocrine gland is present in males but not in females?

Answer the following :

(a) Name the endocrine gland associated with brain?

(b) Which gland secretes digestive enzymes as well as hormones?

(d) Which endocrine gland is present in males but not in females?

What are the major parts of the brain? Mention the functions of different parts.

What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?