What is plasma primarily composed of?

Plasma is primarily composed of water, which constitutes about 90-92% of its volume. This high water content serves as the medium for transporting various substances throughout the bloodstream, including nutrients, hormones, and waste products. Water's role is crucial as it helps maintain blood volume and regulates body temperature.

In addition to water, plasma contains electrolytes, proteins, and other components, but these make up a smaller proportion of its composition. For instance, while proteins are significant for various functions, such as maintaining osmotic balance and aiding in immune responses, they represent only about 7-8% of plasma. Electrolytes contribute to functions such as nerve signaling and muscle contraction, but again, they are present in much smaller amounts compared to water.

Therefore, the description of plasma emphasizes its primary component, which is water, highlighting its essential role in the body’s physiological processes.