The hormone insulin enhances the transport of glucose (sugar) from the blood into most of the body's cells.Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and insulin-secreting cells.How does this negative-feedback system work
A)A decrease in blood glucose concentration stimulates insulin secretion, which in turn further lowers the blood glucose concentration.
B)An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers the blood glucose concentration.
C)A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases the blood glucose concentration.
D)An increase in blood glucose concentration stimulates insulin secretion, which further increases the blood glucose concentration.

Question

Quizplus · Accepted Answer

The negative-feedback system works by increasing or decreasing insulin secretion in response to changes in blood glucose concentration. If blood glucose concentration increases, insulin is secreted, which enhances glucose transport into cells, thus lowering blood glucose concentration. Conversely, if blood glucose concentration decreases, insulin secretion is decreased, leading to a decrease in glucose transport into cells, thus increasing blood glucose concentration. Therefore, option B is the correct choice.

The Hormone Insulin Enhances the Transport of Glucose (Sugar) from the Blood