Which hormone is the antagonist to pth and functions to lower blood calcium levels?
Thyreotropin
Tiroxine
Calcitonin
Phenylalanine
Calcitonin is a 32 amino acid peptide hormone secreted by parafollicular cells of the thyroid gland in humans, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium (Ca2+), opposing the effects of parathyroid hormone (PTH). In its skeleton-preserving actions, calcitonin protects against calcium loss from skeleton during periods of calcium mobilization, such as pregnancy and, especially, lactation.
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Thyreotropin
Tiroxine
Calcitonin
Phenylalanine
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