What is the primary function of plasma in the blood?

The primary function of plasma in the blood is transporting nutrients and waste. Plasma, which makes up about 55% of blood volume, is a straw-colored liquid that contains water, salts, and organic molecules. It plays a crucial role in maintaining homeostasis by serving as the medium through which various substances are transported throughout the body.

Nutrients from the digestive tract, such as glucose, amino acids, and lipids, are absorbed into the plasma and delivered to cells for energy and growth. In addition, plasma helps to transport metabolic waste products, like carbon dioxide and urea, from the tissues to the organs responsible for excretion, such as the lungs and kidneys.

While plasma does have roles in other physiological processes—such as providing necessary components for blood clotting, supporting immune responses with antibodies, and facilitating oxygen transport through its dissolved state or in conjunction with red blood cells—the primary function is more focused on transportation. This essential role ensures that cells receive the necessary components for metabolism while also removing waste efficiently.