Key takeaway
Where urine is made
Before you read
Test yourself first: 3 questions
Question 1 of 3
The functional unit of the kidney, where filtration begins, is the:
Answer: A. The nephron does everything: filters at the glomerulus, reabsorbs what the body needs, and secretes what it must remove.
Question 2 of 3
The kidneys' functional filtering unit is the:
Answer: C. The nephron filters blood and forms urine — about a million per kidney. Alveoli are in lungs, villi in the small intestine.
Question 3 of 3
What is the functional (filtering) unit of the kidney?
Answer: A. The nephron filters blood and forms urine. Alveoli are in the lungs, neurons in the nervous system, and villi in the small intestine.
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