$(a)$ Give the functions of cerebellum. (any two)
$(b)$ Name the components of central nervous system.

$(a)$ An old man is advised by his doctor to take less sugar in his diet. Name the disease from which the man is suffering. Mention the hormone due to imbalance of which he is suffering from this disease. Which endocrine gland secretes this hormone?
$(b)$ Name the endocrine gland which secretes growth hormone. What will be its effect on a person of:
$(i)$ Deficiency of growth hormones?
$(ii)$ Excess secretion of growth hormones?

Involuntary actions in the body are controlled by:

Write true or false for the statement: Deficiency of calcium in our diet causes goitre.

$A$ protective and an insulating sheath of myelin found around the axon is made up of ..........

Give reasons :
$(a)$ Pituitary is often termed as master endocrine gland.
$(b)$ Pancreas helps in digestion and also regulates blood sugar level.
$(c)$ Adrenals are known as glands of emergency.