NEET Zoology Human Excretory System MCQ Question
Which of the following statements about the human excretory system are correct?
The micturition reflex involves contraction of the bladder and relaxation of the urethral sphincter.
Adult humans excrete an average of 2 to 2.5 liters of urine daily.
Urine is typically slightly acidic with a pH around 6.0.
The primary nitrogenous waste excreted by humans is uric acid.
Correct Answer
Detailed Explanation
The micturition reflex does involve the contraction of smooth muscles of the bladder and relaxation of the urethral sphincter to release urine. However, adults excrete about 1 to 1.5 liters of urine daily, and the main nitrogenous waste in humans is urea, not uric acid.
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