Anatomy Practice Exam

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What is the main component of the fluid found between cells known as interstitial fluid?

Blood plasma
Water
Cells
Nutrients

The correct answer is: Water

The main component of interstitial fluid is water. Interstitial fluid is the extracellular fluid that exists in the spaces between cells and acts as a medium for the exchange of nutrients, gases, and waste products between blood and cells. It is essential for maintaining homeostasis within the tissues. Water constitutes the majority of interstitial fluid, typically comprising about 75-90% of its volume. This high water content plays a critical role in facilitating biochemical reactions and providing a solvent for various solutes, enabling the transport of nutrients and waste. While blood plasma is involved in the circulatory system and does contain some interstitial fluid, it is not the primary component of interstitial fluid itself. Cells are the structures that utilize interstitial fluid but do not constitute it. Nutrients are dissolved within the interstitial fluid but again do not represent the main component, which is fundamentally water.