Urine differs in composition from the fluid that first enters a nephron tubule by filtration because

Question

Quizplus · Accepted Answer

Urine is produced by the modification of the original filtrate that enters the nephron tubule by filtration. The filtrate contains water, salts, glucose, amino acids, urea, and other wastes. As the filtrate flows through the nephron, some substances are reabsorbed back into the bloodstream, and others are secreted into the tubule. The end result is that the urine that exits the body contains less water and more salts than the original filtrate. It also contains urea, which is a waste product that is removed from the blood by the kidneys. Therefore, choice C is the correct option.

Urine Differs in Composition from the Fluid That First Enters