Calcium Regulation Hormones Quiz

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Questions and Answers

What is the primary effect of PTH on the kidneys?

Reduces reabsorption of calcium ions
Increases tubular secretion of sodium
Increases tubular reabsorption of calcium ions (correct)
Lowers phosphate reabsorption

What triggers the secretion of PTH in the blood?

Decrease in ionized Ca2+ levels (correct)
Increase in vitamin D levels
Increase in ionized Ca2+ levels
Decrease in calcitonin levels

What process does PTH activate in the bone?

Calcification of bone
Bone resorption (correct)
Bone remodeling without resorption
Bone formation

Which of the following hormones is NOT involved in regulating serum Ca2+ levels?

<p>Insulin (A)</p> Signup and view all the answers

What is one of the actions of PTH in relation to vitamin D?

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

Flashcards

Parathyroid Hormone (PTH)

A hormone that increases blood calcium levels by stimulating bone resorption (breaking down bone to release calcium), increasing calcium reabsorption in the kidneys, and activating vitamin D.

Calcitonin

A hormone that decreases blood calcium levels by inhibiting bone resorption and stimulating calcium excretion in the kidneys.

Bone Resorption

A process where bone tissue is broken down by osteoclasts, releasing calcium into the bloodstream.

Vitamin D

A hormone that increases blood calcium levels by promoting calcium absorption in the intestines.

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Calcium Homeostasis

The regulation of blood calcium levels, primarily controlled by PTH, calcitonin, and vitamin D.

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Study Notes

Calcium Regulation Hormones

Three hormones regulate serum calcium (Ca2+): parathyroid hormone (PTH), vitamin D, and calcitonin.
These hormones adjust secretion according to ionized Ca2+ levels.
PTH release is triggered by low ionized Ca2+ and inhibited by high levels.

PTH Effects

PTH significantly influences bone and kidneys.
In bone, PTH activates osteoclasts, leading to bone resorption and Ca2+ release into the extracellular fluid (ECF).
In kidneys, PTH promotes Ca2+ reabsorption in the tubules.
PTH also stimulates the kidneys to produce active vitamin D.