What is a primary function of the pituitary gland?

• A. Releases hormones into the body and controls other glands
• B. Regulates digestion
• C. Filters blood plasma
• D. Coordinates muscle movement

Answer: (A)

The pituitary gland serves as the central regulator of the endocrine system, releasing hormones into the bloodstream and shaping the activity of other glands. Its anterior lobe sends out tropic hormones such as TSH, ACTH, and the gonadotropins, which stimulate the thyroid, adrenal glands, and gonads, while its growth hormone affects growth and metabolism. The posterior lobe releases hormones like antidiuretic hormone and oxytocin, under hypothalamic control, further illustrating how the pituitary coordinates multiple hormonal systems. This coordinating role—driving downstream glands and broad bodily processes—is what makes it the primary function of the pituitary. In contrast, digestion is governed by the gastrointestinal tract and associated organs, filtration of the blood plasma is a kidney function, and coordinated muscle movement relies on brain regions like the cerebellum and motor cortex, not the pituitary.