Which of the following statements correctly describes hormones?
A)All are regulated by the hypothalamus.
B)They are secreted by endocrine glands through ducts into the blood.
C) They must combine with specific receptors on their target cells in order to exert their effects.
D) They are produced in a gland and act on the target cells in different tissues.

Question

Quizplus · Accepted Answer

Hormones are produced in endocrine glands such as the pituitary, thyroid, adrenal, and many others, and they travel through the bloodstream to reach target cells in different tissues throughout the body. Once they reach their target cells, they bind to specific receptors on the surface of those cells and exert their effects. The hypothalamus plays an important role in regulating hormone secretion but not all hormones are regulated by the hypothalamus. Hormones are not usually secreted through ducts into the blood, as that is the role of exocrine glands such as sweat glands and salivary glands.

Which of the Following Statements Correctly Describes Hormones