15. Parathyroid hormonea. stimulates osteoblasts to lay down new bone.b. reduces blood calcium levels.c. stimulates calcitonin release.d. is produced by the thyroid gland.e. is released when blood calcium levels fall.
Question
- Parathyroid hormonea. stimulates osteoblasts to lay down new bone.b. reduces blood calcium levels.c. stimulates calcitonin release.d. is produced by the thyroid gland.e. is released when blood calcium levels fall.
Solution
The correct answer is e. Parathyroid hormone is released when blood calcium levels fall.
Here's a step-by-step explanation:
a. Parathyroid hormone does not stimulate osteoblasts to lay down new bone. Instead, it stimulates osteoclasts, which break down bone and release calcium into the bloodstream.
b. Parathyroid hormone does not reduce blood calcium levels. It actually increases them by stimulating the release of calcium from bones and increasing the kidneys' reabsorption of calcium.
c. Parathyroid hormone does not stimulate calcitonin release. Calcitonin is a hormone produced by the thyroid gland that lowers blood calcium levels, acting in opposition to parathyroid hormone.
d. Parathyroid hormone is not produced by the thyroid gland. It is produced by the parathyroid glands, which are four small glands located behind the thyroid.
e. Parathyroid hormone is released when blood calcium levels fall. This is its primary function. When blood calcium levels are low, the parathyroid glands sense this and release parathyroid hormone. This hormone then acts to increase blood calcium levels.
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