The overall purpose of homeostasis in the body is to

store fat and release energy.
act as the building blocks for proteins.
maintain a stable internal environment.
send and receive information throughout the body.

delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in article i, section 8 of the constitution. this includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a post office.