Which substance in plasma is critical for transporting nutrients?

Glucose is a crucial substance in plasma for transporting nutrients because it serves as a primary energy source for cells throughout the body. When carbohydrates are consumed, they are broken down into glucose, which then enters the bloodstream. This process ensures that glucose can be efficiently distributed to various tissues that require it for metabolism, growth, and energy production.

While other substances listed play important roles in the body, their functions are not primarily related to nutrient transport in the same direct manner as glucose. For instance, electrolytes are essential for maintaining fluid balance and conducting nerve impulses but do not transport nutrients directly. Globulins, a type of protein in plasma, are involved in immune functions and transport of specific molecules but are not directly responsible for general nutrient transport. Fibrinogen is crucial for blood clotting rather than nutrient transport.

Thus, glucose stands out as the key molecule for transporting nutrients in the plasma, making it the correct answer in this context.