Parathyroid Cells Are Inhibited from Synthesizing and Releasing PTH When

question 19

Multiple Choice

Parathyroid cells are inhibited from synthesizing and releasing PTH when circulating calcium levels are high.When calcium levels fall,the inhibition is removed,PTH is synthesized and released,and calcium levels rise in the blood until the parathyroid cells are once again inhibited.This process is an example of

• A) negative feedback.
• B) induction.
• C) down regulation.
• D) up regulation.
• E) positive feedback.

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