The organ system that consists of ductless glands that secrete hormones and the molecular receptors on target cells that respond to the hormones is known as the:
(A) digestive system.
(B) respiratory system.
(C) circulatory system.
(D) endocrine system.
(E) nervous system.
Answer (3)
(D), endo crine system
The correct answer is the endocrine system, which consists of ductless glands that secrete hormones and their corresponding molecular receptors. This system plays a vital role in regulating various bodily functions through the chemical communication of hormones. Key glands include the pituitary, thyroid, and adrenal glands, among others.
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