Texas Medical Assistant Certification Practice Test

What percentage of the human body is composed of water?

1. 50%

2. 60%

3. 70%

4. 80%

The correct answer is: 70%

The human body is composed of approximately 60% water, making this figure the most widely accepted estimate within the medical and biological fields. Water is an essential component of every cell and plays a critical role in various bodily functions, including temperature regulation, nutrient transport, and waste removal. The percentage can vary based on factors such as age, sex, and body composition. For instance, infants have a higher water content of about 75%, while the percentage tends to decrease with age. Understanding that the human body is primarily made up of water highlights its importance in maintaining physiological balance and supporting overall health. This foundational knowledge is crucial for healthcare professionals, including medical assistants, as it informs their approach to patient care, hydration strategies, and the body's response to various medical conditions.