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Which of the following statements regarding the homeostasis regulation of blood calcium is FALSE? Calcitonin inhibits the action of osteoclasts while having no effect on osteoblast activity. This helps to lower the blood calcium level whenever it exceeds 11 mg/dL. PTH is secreted by the parathyroid glands and raises blood calcium levels that are below 8.5 mg/dL. The homeostasis of blood calcium is regulated by a negative feedback mechanism. The three main organs that serve as the site for the regulation of blood calcium levels are the bones, the intestines, and the pancreas.

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The answer is; The three main organs that serve as the site for the regulation of blood calcium levels are the bones, the intestines, and the pancreas.

The pancreas is not involved in calcium regulation in the body. Other than bone and small intestines, the other organs significant in this homeostasis of calcium in the blood are the kidneys, thyroid gland, and the brain. When the calcium level is too low, PTH is produced by the parathyroid gland and causes bone resorption, increased uptake of calcium in small intestines and increased re-absorption of the ions in the kidneys. When the calcium level is too high, calcitonin is produced by the thyroid gland and reduces bone resorption/ increases bone calcium absorption., and reduces reabsorption in the kidneys.


The three main organs that serve as the site for the regulation of blood calcium levels are the bones, the intestines, and the pancreas. This statement is false regarding the homeostasis regulation of blood calcium.

Further Explanation:

Homeostasis is a dynamic process that allows an organism to keep a check on its physiological condition for the survival of life. It is an essential regulatory condition for the functioning of life properly by maintaining all the physiological aspects maintained in a narrow range. When the body temperature falls, the hypothalamus stimulates a set of the process like constriction of blood vessels and muscle contraction to produce heat.

The calcium homeostasis is regulated by several hormones such as calcitonin and parathyroid hormone. Calcitonin helps in lowering the blood calcium level whereas “parathyroid hormone” helps in increasing the blood calcium level.“Calcitonin” hormone plays an important role in maintaining blood calcium in the blood. When the blood calcium concentration increases, it stimulates the uptake of calcium into bones and lowers its level in the blood.

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Answer Details:

Grade: High School

Subject: Biology

Topic: Homeostasis

Keywords:

Homeostasis, calcitonin, regulated, blood, calcium, uptake, bones, parathyroid, blood vessels, narrow range, heat, constriction.

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