Multiple Choice
Which hormone is produced by the digestive tract?
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16. The Endocrine System
Introduction to the Endocrine System
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Which hormone is the antagonist to parathyroid hormone (PTH) and functions to lower blood calcium levels?
A
Insulin
B
Aldosterone
C
Calcitonin
D
Glucagon
Verified step by step guidance1
Identify the primary function of parathyroid hormone (PTH), which is to increase blood calcium levels by stimulating osteoclast activity, increasing intestinal calcium absorption, and reducing calcium excretion in the kidneys.
Understand that an antagonist hormone would have the opposite effect of PTH, meaning it would work to decrease blood calcium levels.
Review the functions of the given hormones: Insulin regulates blood glucose levels, Aldosterone regulates sodium and potassium balance, and Glucagon increases blood glucose levels.
Recognize that Calcitonin is the hormone that lowers blood calcium levels by inhibiting osteoclast activity, which reduces the release of calcium from bones.
Conclude that Calcitonin is the correct antagonist to PTH, as it functions to lower blood calcium levels, counteracting the effects of PTH.
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