A Level Biology Practice Exam

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Which of the following accurately describes tissue fluid?

it is found only in blood vessels
it provides a medium for nutrient and waste exchange
it is composed exclusively of water
it contains only waste products from cells

The correct answer is: it provides a medium for nutrient and waste exchange

Tissue fluid, also known as interstitial fluid, plays a crucial role in the exchange of nutrients and waste between blood and cells. It occupies the spaces between cells in tissues, providing an essential medium through which substances can diffuse. This fluid allows oxygen, nutrients, and hormones to pass from blood vessels to surrounding cells, while simultaneously enabling waste products to diffuse from the cells back into the bloodstream for removal. While it's true that tissue fluid predominantly consists of water, it is not composed exclusively of water; it contains electrolytes, proteins, and various metabolites that facilitate its functions. Thus, the statement that it provides a medium for nutrient and waste exchange is a comprehensive description of its role and highlights its importance in cellular processes.