Which of the following options lists the major glands of the endocrine system?

Which of the following options lists the major glands of the endocrine system?

• A. Pineal gland, hypothalamus, pituitary, thyroid, parathyroid, thymus, adrenals, pancreas, ovaries, and testes
• B. Heart, Lungs, Kidneys, Liver
• C. Spleen
• D. Adrenal medulla only

Answer: (C)

Glands that secrete hormones into the bloodstream drive the endocrine system’s regulatory functions. The option that lists pineal gland, hypothalamus, pituitary, thyroid, parathyroid, thymus, adrenal glands, pancreas, ovaries, and testes includes the central home base (hypothalamus and pituitary) and the major hormone-secreting organs throughout the body. This broad set captures the key endocrine players responsible for coordinating metabolism, growth, calcium balance, reproduction, immune signaling, and stress responses. The spleen isn’t an endocrine gland; it’s a lymphoid organ involved in immune function, so it doesn’t belong on a list of major endocrine glands. The other options point to non-endocrine structures (like heart, lungs, kidneys, liver) or to only a portion of an endocrine organ (such as the adrenal medulla alone), which doesn’t represent the full suite of major hormone-secreting glands.

Glands that secrete hormones into the bloodstream drive the endocrine system’s regulatory functions. The option that lists pineal gland, hypothalamus, pituitary, thyroid, parathyroid, thymus, adrenal glands, pancreas, ovaries, and testes includes the central home base (hypothalamus and pituitary) and the major hormone-secreting organs throughout the body. This broad set captures the key endocrine players responsible for coordinating metabolism, growth, calcium balance, reproduction, immune signaling, and stress responses.

The spleen isn’t an endocrine gland; it’s a lymphoid organ involved in immune function, so it doesn’t belong on a list of major endocrine glands. The other options point to non-endocrine structures (like heart, lungs, kidneys, liver) or to only a portion of an endocrine organ (such as the adrenal medulla alone), which doesn’t represent the full suite of major hormone-secreting glands.