Dynamic Homeostasis and Feedback Question 12

The graph above shows changes in glucagon and insulin secretions at different concentrations of blood glucose. Which of the following feedback mechanisms is best supported by the data?

A falling glucagon level causes a rise in the insulin level, which maintains equal amounts of both hormones in the blood.

A high glucagon level causes a rise in the insulin level, which maintains high levels of both hormones in the blood.

A low glucose level causes the release of glucagon, which stimulates the release of more glucose from tissues, which in turn lowers the amount of glucagon being released.

A low glucose level causes the release of insulin, which stimulates the release of more glucose from tissues, which in turn increases the amount of insulin being released.