ASCP Medical Laboratory Technician (MLT) Practice Exam

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What percentage of plasma volume is made up of water?

75-80%

80-85%

90-92%

Plasma is the liquid component of blood and comprises approximately 90-92% water. This high water content is crucial as it serves various functions, such as facilitating the transport of nutrients, hormones, and waste products throughout the body. The remaining component of plasma consists of proteins, electrolytes, and other substances, but the predominant factor is indeed water.

While answers suggesting lower percentages (like 75-80% or 80-85%) and a much higher percentage (95-97%) might seem plausible at first glance, they do not accurately represent the well-established composition of plasma. The 90-92% range reflects current understanding based on scientific data regarding plasma's makeup, providing ideal conditions for its physiological roles.

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95-97%

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