Final answer:
The answer to the question is 50 to 70 percent. The percentage of water in the human body varies with certain factors like age and health but typically falls within this range in adults.
Step-by-step explanation:
The human body consists of a significant proportion of water by weight. For adults, the body is approximately 50 to 70 percent water. This percentage can vary depending on factors such as age, overall health, and body composition. However, on average, a adult human body will be within this range. The water is distributed throughout the body, being a major component of both intracellular and extracellular fluids. In infants, the water content is even higher, constituting about 75 percent of their body mass. Conversely, in old age, the body water content can decrease to as low as 45 percent.
Specific organs and tissues in the body have differing water contents. The brain and kidneys are among the organs with the highest water content, at 80-85 percent, whereas teeth have the lowest, with water constituting 8-10 percent of their mass. Water is critical for many bodily functions, including serving as a lubricant and cushion for tissues and organs, as well as being essential for the numerous biochemical reactions that occur within cells.