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Question

Tropic hormones from the anterior pituitary directly affect the release of which of the following? 


A
Parathyroid hormone 
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B
Calcitonin 
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C
Thyroxine 
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D
Epinephrine 
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Solution

The correct option is C Thyroxine 
Hormones secreted by the anterior pituitary are called tropic hormones as they have other endocrine glands as targets. The pars distalis region of pituitary,
commonly called anterior pituitary, produces thyroid stimulating hormone (TSH). TSH stimulates the synthesis and secretion of thyroid hormones (thyroxine is one of them) from the thyroid gland. Calcitonin is also secreted by the thyroid gland but is not under the control of trophic hormones. The parathyroid glands secrete a peptide hormone called parathyroid hormone (PTH). The secretion of PTH is regulated by the circulating levels of calcium ions. The adrenal medulla secretes two hormones called adrenaline or epinephrine and noradrenaline or norepinephrine. Adrenaline and noradrenaline are rapidly secreted in response to the stress of any kind and during emergency situations and are called emergency hormones or hormones of Fight or Flight.

Biology

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