Water's Solvent Role in Blood Transport

Steps:

• Blood functions as a transport medium in mammals, carrying nutrients, gases, and wastes.
• Water comprises ~92% of blood plasma, acting as the primary solvent.
• Solvent property dissolves polar substances (e.g., glucose, ions, hemoglobin-bound oxygen) for circulation.
• High latent heat of vaporization aids body cooling via sweat evaporation, unrelated to internal blood transport.

Why B is correct:

• Water's polarity enables it to form hydrogen bonds with polar solutes, dissolving them per "like dissolves like" principle, essential for blood's transport of dissolved substances.

Why the others are wrong:

• A: Latent heat is for thermoregulation, not blood transport; solvent is essential.
• C: Latent heat is not essential for transport, only solvent property is.
• D: Solvent property is essential for dissolving blood components.

Final answer: B