Which of the following processes is an example of positive feedback?

Which of the following processes is an example of positive feedback?
A . High blood glucose levels stimulate insulin release, which makes muscle and liver cells take in glucose
B . Low blood oxygen levels stimulate erythropoietin production which increases red blood cell production by bone marrow
C . High CO2 blood levels stimulate respiration which decreases blood CO2 levels
D . Low blood calcium levels stimulate parathyroid hormone release from the parathyroid gland. Parathyroid hormone stimulates calcium release from bones.
E . Increased nursing stimulates increased milk production in mammary glands

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Answer: E

Explanation:

In a positive feedback loop, an action intensifies a chain of events that, in turn, intensify the conditions that caused the action beyond normal limits. Nursing stimulates lactation, which promotes nursing. Contractions during childbirth, psychological hysteria, and sexual orgasm are all examples of positive feedback.