Answer:
Glycogenolysis is the process by which glycogen is broken down into glucose, which is then available for energy production. It is stimulated by the activation of the sympathetic nervous system, which releases the hormone epinephrine (adrenaline) and norepinephrine into the bloodstream.
When norepinephrine binds to the Beta receptors on muscle cells, it activates a series of signaling pathways that lead to the activation of enzymes responsible for glycogenolysis. However, there are other pathways that can also stimulate glycogenolysis, such as the activation of the Alpha receptors on muscle cells.
Therefore, even if a drug that blocks the Beta receptors for norepinephrine is administered, glycogenolysis can still occur during exercise through the activation of other pathways. However, the rate of glycogenolysis may be reduced in the absence of Beta receptor activation.