American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

What percentage of water in the human body is found within the cells?

1. 40%

2. 50%

3. 60%

4. 70%

The correct answer is: 60%

The correct answer indicates that approximately 60% of the water in the human body is found within the cells, which is a crucial aspect of human physiology. This intracellular water is essential for numerous cellular functions, including maintaining cell shape, facilitating biochemical reactions, and transporting nutrients and waste products. Understanding that about two-thirds of the body's total water is located inside cells highlights the importance of the cellular environment in overall health. This water serves as a solvent for various metabolic processes and helps in regulating temperature and cellular homeostasis. The total body water percentage is divided into intracellular and extracellular compartments, with the majority residing within the cells, reflecting the significant role of water in cellular function and structure. Recognizing the distribution of water in the body—approximately 60% intracellular versus the remaining in extracellular spaces—is fundamental for professionals in healthcare and biology as it directly relates to how body systems function and respond to changes in hydration and overall health status.