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Endocrinology: Calcium Regulation Quiz

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Questions and Answers

What role does the parathyroid hormone (PTH) play in response to low blood calcium levels?

Enhances calcitonin secretion to lower blood calcium
Inhibits the absorption of calcium in the intestines
Stimulates osteoclast activity to release calcium from bone (correct)
Increases osteoblast activity to store more calcium

Which of the following is a consequence of hypercalcemia?

Skeletal muscle problems (correct)
Vitamin D deficiency
Osteoporosis
Rickets

What initial process occurs when UV rays penetrate the skin?

The kidney conserves calcium
Osteoclast activity is stimulated
Vitamin D is converted to its active form
Vitamin D becomes water soluble (correct)

How does the kidney contribute to calcium homeostasis?

<p>It conserves calcium from filtration and modifies active Vitamin D (A)</p> Signup and view all the answers

Which gland is responsible for sensing elevated calcium levels in the bloodstream?

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

Flashcards

Hypercalcemia

High blood calcium levels, above 10.5 mg/dL.

Hypocalcemia

Low blood calcium levels, below 8.5 mg/dL.

Vitamin-D Pathway

The process where Vitamin-D is activated and regulates calcium levels in the body.

Calcitonin

Hormone released by the thyroid gland to decrease blood calcium levels.

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Parathyroid Hormone (PTH)

Hormone released by parathyroid glands to increase blood calcium levels.