Which component of the blood is a liquid and makes up most of its volume?

Plasma is the component of blood that is a liquid and constitutes the majority of its volume. It is a yellowish fluid that accounts for about 55% of total blood volume. Plasma serves as the medium for transporting various substances throughout the body, including nutrients, hormones, waste products, and proteins, as well as assisting with maintaining blood pressure and regulating body temperature.

The composition of plasma includes water (approximately 90-92%), which provides fluidity, along with proteins such as albumin, globulins, and fibrinogen, which play essential roles in functions such as immune response and clotting. Therefore, understanding the significance of plasma is crucial in the context of blood function and overall physiology.