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Questions and Answers
Calcitonin is produced in which cells of the thyroid?
Calcitonin is produced in which cells of the thyroid?
- Parafollicular cells (correct)
- Pancreatic cells
- Adrenal cells
- Follicular cells
What is the function of calcitonin?
What is the function of calcitonin?
- Increase blood calcium levels
- Inhibit bone formation
- Promote bone breakdown
- Reduce blood calcium levels (correct)
How does calcitonin work in relation to parathyroid hormone?
How does calcitonin work in relation to parathyroid hormone?
- They have the same function
- They have opposite functions (correct)
- Calcitonin is produced by the parathyroid gland
- They work together to regulate blood calcium levels
What is the function of parathyroid hormone?
What is the function of parathyroid hormone?
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Where is parathyroid hormone secreted from?
Where is parathyroid hormone secreted from?
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What is the target tissue of calcitonin?
What is the target tissue of calcitonin?
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How does parathyroid hormone affect calcium absorption from food?
How does parathyroid hormone affect calcium absorption from food?
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What is the effect of parathyroid hormone on calcium in the bone?
What is the effect of parathyroid hormone on calcium in the bone?
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Study Notes
Thyroid Hormones
- Calcitonin is produced in the parafollicular cells (C-cells) of the thyroid gland.
Functions of Calcitonin and Parathyroid Hormone
- Calcitonin's primary function is to lower blood calcium levels by inhibiting bone resorption and promoting calcium excretion in the kidneys.
- Parathyroid hormone's primary function is to increase blood calcium levels by stimulating bone resorption and enhancing calcium absorption in the intestines.
Interplay between Calcitonin and Parathyroid Hormone
- Calcitonin and parathyroid hormone work in opposition to each other to maintain calcium homeostasis in the body.
Parathyroid Hormone
- Parathyroid hormone is secreted from the parathyroid glands, which are four small glands located behind the thyroid gland.
- The target tissue of parathyroid hormone is bone, where it stimulates the release of calcium into the bloodstream.
Calcium Regulation
- Parathyroid hormone increases calcium absorption from food by stimulating the activation of vitamin D in the kidneys.
- Parathyroid hormone also stimulates the release of calcium from bone into the bloodstream, leading to an increase in blood calcium levels.
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