Final answer:
The pituitary gland is known as the "master gland" because it controls other endocrine glands in the body. In females, it also plays a role in controlling the menstrual cycle, lactation, and metabolism.
Step-by-step explanation:
The pituitary gland, located at the base of the brain, is known as the "master gland" because it controls the activities of other endocrine glands in the body. In females, it plays a key role in controlling the menstrual cycle, lactation, and metabolism. It secretes hormones that regulate fluid levels, growth, and development, and also stimulates the production of milk by the mammary glands following childbirth.