Length of membranous urethra is about ___________ ?
Correct answer: A. 1 cm
- A. 1 cm
- B. 2 cm
- C. 5 cm
- D. 9 cm
Explanation
The membranous urethra is the shortest part of the male urethra and is about 1 cm long. Students may choose 2 cm because some references give an approximate value near 1.25 cm, but 1 cm is the closest option.
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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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