Final answer:
Water is indispensable to the human body because it acts as a solvent, allowing it to dissolve and transport various substances such as nutrients and waste, and helps maintain homeostasis.
Step-by-step explanation:
Water is essential to the human body for several reasons. Among the answer choices given, 'A' is incorrect because water does not prevent large changes in blood pH, rather the proteins and other compounds in blood act as buffers to regulate pH. 'C' is also incorrect since water does not dissolve nonpolar fats and oils; in fact, water is a polar molecule and therefore it does not mix well with nonpolar substances, which are hydrophobic or 'water-fearing.' 'D' is partially misleading because while substances dissolved in blood plasma are solutes, water itself does not form these solutes. However, 'B' is correct as water is an excellent solvent due to its polar nature, which allows it to dissolve and transport substances within the body, such as nutrients and waste products.
Water's solvent properties are crucial for bodily functions. It allows the distribution of essential nutrients and oxygen to cells and facilitates the removal of waste. Moreover, water aids in maintaining a homogeneous solution within the bloodstream, ensuring that these solutes are evenly distributed throughout the body. Lastly, water's high heat capacity helps in regulating body temperature. Without water's ability to function as a solvent, the biochemical processes necessary for life would not occur efficiently.