Why is pituitary gland called master endocrine gland?

Why pitutary gland is called master gland?

What is endocrine gland?

Define endocrine glands

Why is pancreas called a heterocrine gland?

These questions consist of two statements each,printed as Assertion and Reason.While answering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:Pituitary gland is also called master gland. Reason:It secretes a number of trophic hormones which regulate secretion from other endocrine glands.

Name an ectomesodermal endocrine gland.