Blood plasma is the yellowish liquid component of blood that makes up about 55% of its total volume. It is primarily composed of water, but also contains proteins, electrolytes, hormones, and waste products. Plasma plays a crucial role in transporting nutrients, gases, and waste products throughout the body. In addition to its transport functions, blood plasma helps maintain blood pressure and volume. It also contains important proteins, such as albumin and globulins, which are essential for immune function and blood clotting. Overall, plasma is vital for maintaining homeostasis and supporting various bodily functions.