Multiple Choice
How are the nervous system and the endocrine system different in terms of their signaling mechanisms?
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16. The Endocrine System
Introduction to the Endocrine System
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PTH is a hormone released by the parathyroid glands in response to which of the following?
A
Low blood calcium levels
B
High blood calcium levels
C
High blood glucose levels
D
Low blood glucose levels
Verified step by step guidance1
Identify the role of PTH (Parathyroid Hormone) in the body. PTH is primarily involved in the regulation of calcium levels in the blood.
Understand the physiological trigger for the release of PTH. The parathyroid glands release PTH in response to changes in blood calcium levels.
Recall that PTH is released when blood calcium levels are low. This is because PTH acts to increase blood calcium levels by stimulating bone resorption, increasing intestinal calcium absorption, and promoting renal calcium reabsorption.
Eliminate the incorrect options based on the function of PTH. High blood calcium levels would not trigger PTH release, as PTH works to increase calcium levels. Similarly, blood glucose levels are not directly regulated by PTH.
Conclude that the correct condition for the release of PTH is low blood calcium levels, as this aligns with the hormone's role in maintaining calcium homeostasis.
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