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All organisms rely on homeostasis to maintain a stable internal environment for normal physiological function. Insulin is a protein hormone essential in the regulation of blood glucose, and an absence of insulin causes the medical condition known as diabetes. The mechanism of insulin action is illustrated below:

"Insulin Action."Wikipedia Commons. N.p., n.d. Web.

Which of the following BEST explains how insulin is involved in maintaining homeostasis?

A

Insulin combines with its membrane receptor and initiates a response in the target cell. The response includes the conversion of glucose into glycogen inside the cell, and this demonstrates positive feedback.

B

The glucose transporter protein triggers the transport of insulin into the cell, and signal transduction leads to the conversion of glucose into glycogen, fatty acids, and pyruvate.

C

Insulin and glucose work simultaneously to produce glycogen, fatty acids, and pyruvate via negative feedback.

D

Insulin binds to cell receptors, which causes a drop in blood sugar when glucose moves into the target cell and is converted to glycogen. This demonstrates negative feedback.

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