The body's reaction to parathyroid hormone (PTH), raising plasma levels of calcium, can be opposed by calcitonin.
Therefore, the correct answer is Option D.
How do PTH and calcitonin act on the body?
- The parathyroid hormone (PTH) is a polypeptide of 83-85 amino acids secreted by the parathyroid gland which helps to raise the levels of calcium in the blood.
- The PTH is secreted in response to low calcium levels detected in the blood.
- Calcitonin opposes the action of parathyroid hormone by decreasing the calcium level in the blood.
- It is produced by the C cells located in the thyroid gland.
- The PTH functions by increasing the levels of Ca+2 by promoting absorption in the intestine and reabsorption of Ca+2 in the kidneys.
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