Which gland secretes growth hormone in human beings?

Mention one function for each of these hormones:
$(a)$ Thyroxin
$(b)$ Insulin
$(c)$ Adrenaline
$(d)$ Growth hormone
$(e)$ Testosterone.

$(a)$ Name the hormone which is injected to a diabetic patient.
$(b)$ Why should we use iodised salt in our diet?
$(c)$ If iodine is insufficient in one's diet,what might be the deficiency disease and its symptoms?

Which endocrine gland controls the functioning of most other endocrine glands?

Dwarfism results due to :

The hormones secreted from which gland regulate the function of the pituitary gland?