Which of These Is an Example of a Positive-Feedback Mechanism

question 10

Multiple Choice

Which of these is an example of a positive-feedback mechanism?

• A) An increase in blood pressure activates mechanisms that decrease blood pressure.
• B) Increased amounts of a hormone in the blood cause a decrease in the secretion of that hormone.
• C) Increased carbon dioxide in the blood increases breathing rate, which decreases carbon dioxide in the blood.
• D) Increased amounts of fluid in the blood result in increased quantities of urine, which decreases fluid content of the blood.
• E) Increased stretch of the uterus causes it to contract, which further increases stretch.

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