What is the main component of all body fluids?

• A. Glucose
• B. Water (\(H_2O\))
• C. Sodium chloride (NaCl)
• D. Protein

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the composition of body fluids. Body fluids include blood, lymph, saliva, and intracellular and extracellular fluids. These fluids are primarily composed of water, which serves as the solvent for various dissolved substances.
2. Step 2: Recognize the role of water (\(H_2O\)) in body fluids. Water is the main component because it facilitates chemical reactions, transports nutrients and waste, regulates temperature, and maintains cellular structure.
3. Step 3: Evaluate the other options provided in the question. Glucose, sodium chloride (NaCl), and proteins are important components of body fluids but are dissolved in water rather than being the main component.
4. Step 4: Understand why water is the correct answer. Water makes up approximately 60-70% of the human body and is essential for maintaining homeostasis and supporting life processes.
5. Step 5: Conclude that water (\(H_2O\)) is the main component of all body fluids, as it is the universal solvent and the medium in which other substances are dissolved and transported.