Which of the Following is a Source of Water Input

Question

Which of the following is a source of water input?
A) digestive tract only
B) renal tubules only
C) metabolism only
D) both digestive tract and metabolism
E) both the digestive tract and renal tubules

Accepted Answer

Water input comes from both the digestive tract, where water is absorbed from food and drink, and metabolism, where water is produced as a byproduct of biochemical reactions within the body.