What does insulin do in relation to blood glucose levels?

Insulin plays a crucial role in the regulation of blood glucose levels, acting as a key hormone that facilitates the uptake of glucose by tissues, particularly muscle and adipose (fat) tissues. By stimulating glucose absorption, insulin helps decrease the concentration of glucose in the bloodstream. This is important for maintaining homeostasis and ensuring that cells have the necessary energy to function properly.

Moreover, insulin inhibits glycogenolysis, which is the process of breaking down glycogen (the stored form of glucose) into glucose. By preventing glycogenolysis, insulin reduces the release of glucose from the liver into the bloodstream, contributing further to lower blood glucose levels.

Therefore, the choice that includes both the stimulation of glucose absorption by tissues and the inhibition of glycogenolysis accurately reflects the dual actions of insulin in managing blood glucose levels, making it the correct answer. Through these mechanisms, insulin ensures that glucose levels are kept within a healthy range in the body.