Question

A hormone called parathyroid hormone acts to help raise the blood calcium concentration. According to the principles of negative feedback, an effective stimulus for parathyroid hormone secretion would be...

A) Elevated blood calcium levels
B) Decreased blood calcium levels
C) Constant blood calcium levels
D) Presence of vitamin D

Answer 1

An effective stimulus for parathyroid hormone secretion would be decreased blood calcium levels.

Step-by-step explanation:

Negative feedback is a regulatory mechanism that helps maintain homeostasis in the body. According to the principles of negative feedback, an effective stimulus for parathyroid hormone secretion would be decreased blood calcium levels. When blood calcium levels are low, the parathyroid glands release parathyroid hormone (PTH) which acts on the skeleton, kidneys, and intestine to increase blood calcium levels. PTH stimulates the release of calcium from the bones, reabsorption of calcium in the kidneys, and absorption of dietary calcium by the intestines.