Texas Medical Assistant Certification Practice Test

Which statement about water in the body is true?

1. It makes up more than 85% of the body.

2. It only aids in digestion.

3. It is used for lubrication and cushioning joints.

4. It regulates body temperature and lubricates and cushions joints.

The correct answer is: It regulates body temperature and lubricates and cushions joints.

Water plays a crucial role in the human body, and the correct statement highlights its multiple functions, particularly in regulating body temperature and providing lubrication and cushioning for joints. Firstly, water helps maintain homeostasis by regulating body temperature through processes such as sweating and respiration. When the body heats up, sweat evaporates from the skin, cooling the body down and helping to prevent overheating. This thermoregulation is vital for optimal physiological functioning. Additionally, water serves as a lubricant in joints, facilitating smooth movement and reducing friction between cartilage surfaces. It also cushions organs and tissues, providing protection against impact and injury. This cushioning effect is especially important for weight-bearing joints, allowing for a full range of motion without pain. The other statements do not capture the full scope of water's functions accurately. While water is indeed crucial for digestion, it does much more than that. It is also not correct to say that it makes up more than 85% of the body, as water typically makes up about 60-70% of an adult’s body weight, depending on various factors including age, sex, and body composition. Thus, the correct answer encompasses these vital roles that water plays in maintaining overall health and functionality in the body.