NEET Zoology Human Excretory System MCQ Question
Which of the following statements about the human excretory system is correct?
Uric acid is excreted by humans as the primary nitrogenous waste.
The micturition reflex involves contraction of bladder muscles and relaxation of the urethral sphincter.
Humans primarily excrete ammonia due to its low toxicity.
Protonephridia are the main excretory structures in vertebrates.
Correct Answer
Detailed Explanation
The micturition reflex is described as the neural mechanisms causing the contraction of bladder muscles and relaxation of the urethral sphincter, leading to urine release. Uric acid is not the primary nitrogenous waste in humans; urea is. Ammonia is highly toxic and not primarily excreted by humans, and protonephridia are found in invertebrates, not vertebrates.
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