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Questions and Answers
Which gland produces Calcitonin?
Which of the following actions is NOT performed by Calcitonin?
What effect does Calcitonin have on osteoclasts?
What mechanism does Calcitonin use to decrease blood calcium levels?
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What is the primary amino acid length of Calcitonin?
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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?
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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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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.
