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Hormones Regulating Calcium Levels

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Questions and Answers

Which gland produces Calcitonin?

Pituitary gland

Parathyroid gland

Adrenal gland

Thyroid gland (correct)

Which of the following actions is NOT performed by Calcitonin?

Promotes calcium absorption in the intestines (correct)

Promotes deposition of calcium into bones

Decreases the level of calcium in the blood

Inhibits calcium reabsorption in the kidney

What effect does Calcitonin have on osteoclasts?

Stimulates osteoclasts

Inhibits osteoclasts (correct)

No effect on osteoclasts

Increases osteoclasts number

What mechanism does Calcitonin use to decrease blood calcium levels?

Inhibits calcium reabsorption in kidneys Signup and view all the answers

What is the primary amino acid length of Calcitonin?

32 amino acids Signup and view all the answers

Which hormone opposes the action of Calcitonin?

Parathyroid hormone (PTH) Signup and view all the answers

What happens to the activity of parathyroid glands when blood calcium levels become too high?

The activity of parathyroid glands decreases Signup and view all the answers

How does Calcitonin affect the deposition of calcium into bones?

It increases calcium deposition by inhibiting osteoclasts and stimulating osteoblasts Signup and view all the answers

Study Notes

Parathyroid Hormone (PTH)

PTH works to increase calcium levels in the blood
When calcium levels return to normal or become too high, the parathyroid glands become less active and secrete less PTH

Calcitonin

Calcitonin is a 32 amino acid hormone produced and released by the C-cells of the thyroid gland
It helps regulate calcium and phosphate levels in the blood

Blood Calcium Regulation via PTH and Calcitonin

The thyroid gland produces calcitonin, which lowers calcium levels in the blood
Calcitonin achieves this by:
- Inhibiting calcium absorption by the intestines
- Inhibiting calcium reabsorption in the kidneys (excreted in the urine)
- Promoting calcium deposition into bones by:
  - Inhibiting osteoclasts (bone resorption)
  - Stimulating osteoblasts (bone formation)

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Description

This quiz covers the roles of parathyroid hormone and calcitonin in regulating calcium levels in the blood. It explains how these hormones interact to maintain calcium homeostasis.