Epinephrine signaling pathway involves enzymes activating other enzymes. It is a series of steps in which a hormone binds to the epinephrine receptor present on the surface of the cell.
Adrenaline is also known as epinephrine which is used as emergency medical hormone in case of severe allergic situations. Epinephrine binds both alpha and beta adrenergic receptors to cause vasoconstriction and vasodilation. It triggers a signal transduction cascade involving production of the second messenger molecule cyclic AMP (cAMP). The role of adenylyl cyclase in the epinephrine signaling pathway is that it accelerates the production of a second messenger. The intracellular concentration of glycogen will increase due to the irreversible binding of GDP to the G protein.
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The epinephrine signaling pathway plays a role in regulating glucose homeostasis in muscle cells. The signaling pathway is activated by the binding of epinephrine to the beta-2 adrenergic receptor. A simplified model of the epinephrine signaling pathway is represented in Figure 1. Based on Figure 1, which of the following statements best describes the epinephrine signaling pathway?