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Calcium Regulation and Hormonal Control

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Questions and Answers

What triggers the secretion of parathyroid hormone (PTH)?

A decrease in ionized Ca2+ (correct)

External calcium intake

Consistent levels of ionized Ca2+

An increase in ionized Ca2+

Which process is activated by PTH in the bones?

Bone ossification

Bone remodeling

Bone calcification

Bone resorption (correct)

What effect does PTH have on the kidneys?

Reduces vitamin D activation

Enhances tubular reabsorption of Ca2+ (correct)

Stimulates bone formation

Increases calcium excretion

What is the action of PTH on vitamin D?

<p>Stimulates renal production of active vitamin D</p> Signup and view all the answers

What hormone is known for opposing the effects of PTH in calcium regulation?

<p>Calcitonin</p> Signup and view all the answers

Study Notes

Calcium Regulation

Three hormones (PTH, vitamin D, calcitonin) regulate serum calcium (Ca2+) levels.
Their secretion rate changes in response to ionized Ca2+ levels.
Parathyroid hormone (PTH) secretion increases when ionized Ca2+ decreases, and vice versa.
PTH affects bone and kidneys.
In bone, PTH activates osteoclasts, causing bone resorption and releasing Ca2+ into the extracellular fluid (ECF).
In kidneys, PTH increases tubular reabsorption of Ca2+ ions, thus conserving calcium.
PTH also stimulates the kidney to produce active vitamin D.

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Description

This quiz delves into the regulation of serum calcium levels through three key hormones: PTH, vitamin D, and calcitonin. It explores their interactions, responses to ionized Ca2+ levels, and the effects on bones and kidneys. Test your understanding of these critical physiological processes.