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Plasma constitutes approximately 55% of blood volume in the human body. It primarily consists of water, which accounts for about 92% of plasma, along with proteins, electrolytes, nutrients, hormones, and waste products. This portion of blood plays a vital role in transporting these substances throughout the body, regulating body temperature, and maintaining pH balance, among other critical functions. The accurate representation of plasma as 55% highlights its significance in the overall composition of blood, distinguishing it from the cellular components, which include red blood cells, white blood cells, and platelets. Understanding this percentage is crucial for anyone studying blood physiology, sports science, or related fields, as it relates to hydration, nutrient transport, and overall health.