AP Biology : Excretory System

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #184 : Systems Physiology

Which of the following would be filtered by the kidney and not found in urine?

Possible Answers:

Sodium

Water

Potassium

Proteins

Urea

Correct answer:

Proteins

Explanation:

Proteins would not be found in the urine because these molecules are too large to pass through the glomerulus of the nephron of the kidney. They would be filtered out and remain in the bloodstream. Meanwhile, all of the other compounds would be present in normal urine. 

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