OSMT (Ontario Society of Medical Technologists) Practice Exam

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What percentage of the total blood does plasma make up, and what percentage of plasma is water?

52%-62% and 91%
91%-92% and 55%
65%-75% and 80%
50%-60% and 50%

The correct answer is: 52%-62% and 91%

The correct answer indicates that plasma makes up 52%-62% of total blood volume, and that approximately 91% of plasma itself is composed of water. Plasma is a critical component of blood, and its volume is significant as it provides the medium for transporting cells, nutrients, hormones, and waste products throughout the body. The percentage range referenced aligns well with commonly accepted physiological knowledge, as plasma typically constitutes about 55% of whole blood, which falls within the 52%-62% range mentioned. Additionally, the high water content of plasma—around 91%—reflects its vital role in maintaining blood volume, regulating temperature, and facilitating biochemical reactions. This water content contributes to the plasma's ability to dissolve and transport substances effectively. Other options either underestimate the percentage of plasma in whole blood or incorrectly represent the water content as it relates to plasma. Therefore, the provided percentage accurately reflects the physiological characteristics of blood and plasma composition.