Answer the following:
$(a)$ Name the endocrine gland associated with the brain.
$(b)$ Which gland secretes digestive enzymes as well as hormones?
$(c)$ Name the endocrine gland associated with the kidneys.
$(d)$ Which endocrine gland is present in males but not in females?

(N/A) The pituitary gland is located at the base of the brain.
$(b)$ The pancreas acts as a heterocrine (mixed) gland,secreting digestive enzymes into the duodenum and hormones like insulin and glucagon into the blood.
$(c)$ The adrenal glands are located on top of each kidney.
$(d)$ The testes are the primary sex organs in males that function as endocrine glands by secreting testosterone.