A client with hyperglycemia is unable to effectively move glucose into the cells. Which hormone deficiency is most likely responsible for this condition?

Insulin is an anabolic peptide hormone synthesized by pancreatic beta cells that serves as the primary biochemical key for cellular glucose uptake. It binds to specific tyrosine kinase receptors, triggering intracellular cascades that translocate GLUT4 transporters to the plasma membrane of skeletal muscle and adipose tissue. A absolute or relative deficit blocks this transport mechanism, trapping glucose in circulation. A. Epinephrine: This catecholamine acts as a counter-regulatory stress hormone that stimulates hepatic glycogenolysis and lipolysis to raise circulating fuel levels. It actively antagonizes insulin action to increase blood glucose during periods of physiological stress. High levels cause hyperglycemia rather than facilitating cellular uptake. B. Cortisol: This glucocorticoid increases systemic glucose availability by upregulating hepatic gluconeogenesis and decreasing peripheral insulin receptor sensitivity. Prolonged elevations drive insulin resistance and raise plasma glucose concentrations. It functions as a hyperglycemic hormone rather than a clearing agent. C. Glucagon: Synthesized by pancreatic alpha cells, this hormone prevents hypoglycemia by stimulating the liver to convert stored glycogen into glucose. It accelerates glucose release into the bloodstream during fasting states to maintain minimum glycemic thresholds. It works directly opposite to clearance and storage pathways. D. Insulin: This specific signaling molecule is required to open the cellular channels that remove glucose from the extracellular fluid compartment. A deficiency prevents tissues from utilizing circulating carbohydrates, producing profound extracellular hyperglycemia alongside cellular starvation. It is the definitive hormone missing in this state.