A patient has a persistently high thyroxine level. Which response is expected in a normal negative feedback system?
Correct answer: C. The hypothalamus and pituitary reduce their stimulating hormones
- A. The hypothalamus increases thyrotropin-releasing hormone
- B. The anterior pituitary increases thyroid-stimulating hormone
- C. The hypothalamus and pituitary reduce their stimulating hormones
- D. The thyroid gland releases more thyroxine to restore balance
Explanation
High thyroxine suppresses hypothalamic thyrotropin-releasing hormone and pituitary thyroid-stimulating hormone. This negative feedback helps return thyroid hormone levels toward normal.
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About Endocrine System
The endocrine system covers hormone-producing glands including the pituitary, thyroid, parathyroids, adrenals, pancreas, pineal gland, ovaries and testes. It explains hormone classes, target-cell responses, feedback control, and the functions of hormones such as insulin, thyroxine, cortisol, growth hormone and ADH, which is often confused with a kidney-produced substance.
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