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Questions and Answers
Which gland produces Calcitonin?
Which gland produces Calcitonin?
- Pituitary gland
- Parathyroid gland
- Adrenal gland
- Thyroid gland (correct)
Which of the following actions is NOT performed by Calcitonin?
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?
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?
What mechanism does Calcitonin use to decrease blood calcium levels?
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What is the primary amino acid length of Calcitonin?
What is the primary amino acid length of Calcitonin?
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Which hormone opposes the action of Calcitonin?
Which hormone opposes the action of Calcitonin?
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What happens to the activity of parathyroid glands when blood calcium levels become too high?
What happens to the activity of parathyroid glands when blood calcium levels become too high?
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How does Calcitonin affect the deposition of calcium into bones?
How does Calcitonin affect the deposition of calcium into bones?
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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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