First slide

Human Endocrine System

Question

Dropping of blood calcium levels below a set point stimulates the release of

Easy

A

thyroxine
B

thyrocalcitonin
C

thymosins
D

parathormone

Solution

A fall in the blood levels of calcium stimulates the release of parathormone (PTH). PTH acts on bones and stimulates the process of bone resorption (dissolution/ demineralisation). it also stimulates reabsorption of Ca²⁺ by the renal tubules and increases Ca²⁺ absorption from the digested food. PTH is a hypercalcemic hormone, i.e., it increases the blood Ca²⁺ levels. Along with TCT, it plays a significant role in calcium balance in the body.

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