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The

   secrete(s) a hormone as a response to hypocalcemia.
Answer and Explanation

The Correct Answer is {"dropdown-group-1":"D"}

A. thymus: The thymus secretes thymosins that influence T-cell maturation (immune function), not hormones that raise blood calcium - so it does not respond to hypocalcemia.
B. thyroid gland: The thyroid’s parafollicular (C) cells secrete calcitonin, which lowers blood calcium in response to hypercalcemia, not hypocalcemia.
C. pituitary gland: The pituitary releases many trophic hormones, but it does not directly secrete the primary hormone (PTH) that corrects hypocalcemia.
D. parathyroid glands: The parathyroid glands secrete parathyroid hormone (PTH) in response to low blood Ca²⁺; PTH raises serum calcium by acting on bone, kidney, and vitamin D activation.
E. pineal gland: The pineal gland secretes melatonin to regulate circadian rhythms, not calcium homeostasis.


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Related Questions

Correct Answer is E

Explanation

A. Heart: The heart is a central component of the circulatory system, but not the only one.
B. Blood vessels: Blood vessels (arteries, veins, capillaries) are essential, but alone they don’t make up the whole system.
C. Blood: Blood is a major component (transport medium), but not the whole system by itself.
D. Heart and blood vessels: These two form the pump and conduits, but blood (the transported fluid) is also required.
E. Heart, blood vessels, and blood: The circulatory system consists of the heart (pump), blood vessels (conduits), and blood (transport medium).

Correct Answer is A

Explanation

A. Prolactin: Prolactin is secreted by the anterior pituitary and stimulates milk production (mammary gland alveolar cells). The arrow at A points to the breast, so prolactin is the appropriate hormone.

B. Follicle-stimulating hormone: FSH is an anterior-pituitary gonadotropin that acts on the ovaries/testes to stimulate follicle development and spermatogenesis, not directly on the mammary gland.

C. Oxytocin: Oxytocin (produced in the hypothalamus and released from the posterior pituitary) causes milk ejection (let-down) and uterine contraction, but the diagram’s arrow and context indicate the anterior-pituitary hormone that stimulates milk production (prolactin).

D. Adrenocorticotropic hormone: ACTH (from the anterior pituitary) targets the adrenal cortex to stimulate cortisol production, not the mammary gland.

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