Which system is described as glands that secrete hormones regulating growth, reproduction, and metabolism?

Which system is described as glands that secrete hormones regulating growth, reproduction, and metabolism?

• A. Endocrine system
• B. Respiratory system
• C. Digestive system
• D. Circulatory system

Answer: (A)

Glands that secrete hormones into the bloodstream coordinate important body functions by acting as chemical messengers. This description points to the endocrine system, which includes glands like the pituitary, thyroid, adrenal, pancreas, ovaries, and testes. Hormones from these glands regulate growth, development, metabolism, and reproduction, and they travel through the blood to distant target cells, producing effects that are often slower to start but longer-lasting than nerve signals. The other systems don’t consist of glands that produce hormones for these wide-ranging regulatory roles; they handle breathing, digestion, or blood transport, while they may carry hormones but don’t primarily secrete them.

Glands that secrete hormones into the bloodstream coordinate important body functions by acting as chemical messengers. This description points to the endocrine system, which includes glands like the pituitary, thyroid, adrenal, pancreas, ovaries, and testes. Hormones from these glands regulate growth, development, metabolism, and reproduction, and they travel through the blood to distant target cells, producing effects that are often slower to start but longer-lasting than nerve signals. The other systems don’t consist of glands that produce hormones for these wide-ranging regulatory roles; they handle breathing, digestion, or blood transport, while they may carry hormones but don’t primarily secrete them.