What does plasma refer to in the context of blood?

Plasma refers to the liquid portion of blood and lymph, making it a crucial component in the circulatory system. It is a yellowish fluid that serves multiple essential functions, including transporting nutrients, hormones, and waste products throughout the body. Plasma is composed mostly of water but also contains proteins, electrolytes, gases, and various other substances that contribute to maintaining osmotic balance and pH levels in the body.

The significance of plasma goes beyond just being a transportation medium; it plays a key role in the body's immune response through the presence of antibodies and assists in blood clotting through clotting factors. Its composition can vary depending on hydration levels, diet, and overall health, but its primary definition remains as the liquid matrix in which blood cells and other components are suspended.