The structural and functional unit of the kidney is the
Correct answer: A. nephron
- A. nephron
- B. neuron
- C. alveolus
- D. ureter
Explanation
Each kidney contains about a million nephrons, and every one carries out filtration, reabsorption and secretion on its own, so the organ's work is the sum of theirs. A nephron runs from the Bowman's capsule through the proximal tubule, loop of Henle and distal tubule to a collecting duct. The ureter merely carries the finished urine to the bladder, and the neuron belongs to the nervous system.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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