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Plasma is the clear, straw-colored fluid component of blood that serves several crucial functions in the circulatory system. It is composed mainly of water, which makes up about 90-92% of its volume, and also contains proteins, hormones, nutrients, waste products, and electrolytes. Plasma plays an essential role in transporting these substances throughout the body, regulating blood pressure and volume, and maintaining pH balance. It is critical for supporting various bodily functions, as it provides the medium in which blood cells are suspended and transported. Understanding the composition and functions of plasma is fundamental for anyone studying blood properties and functions in a healthcare or first aid context.