Discussion Topic #2: Calcium Homeostasis (Endocrine System) Answer

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Discussion Topic #2: Calcium Homeostasis (Endocrine System)

Calcium homeostasis is critical for maintaining healthy body functions. Discuss the endocrine regulation of calcium homeostasis by answering:

(A) Identify the two major hormones that regulate plasma calcium concentration and the stimulus for their release/activation.

(B) Discuss the mechanisms by which these hormones increase extracellular calcium concentration.

 

 

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Discussion Topic #2: Calcium Homeostasis (Endocrine System) Answer

A.) The two main hormones that regulate calcium are the parathyroid hormone and 1,25-dihydroxyvitamin D. The parathyroid hormone (PTH) is a protein hormone secreted by the parathyroid gland, and is regulated by the binding of extracellular Ca2+ ions to the Ca2+ receptors of secretory cells in the gland. An decrease in the plasma Ca2+ concentration stimulates the PTH secretion, while Ca2+ increase inhibits it. 

This question is taken from Physiology 001 – Introduction to Human Physiology » Winter 2021 » Discussions