NEET Zoology Human Excretory System MCQ Question
Which of the following statements about the human excretory system is correct?
The kidneys help in osmoregulation by regulating the volume and composition of body fluids.
Ureter is the main organ responsible for the filtration of blood in the human body.
Micturition involves the contraction of the bladder and tightening of the urethral sphincter.
The urine produced by the kidneys is primarily composed of ammonia as the main nitrogenous waste.
Correct Answer
Detailed Explanation
The kidneys are essential for osmoregulation, maintaining ionic and fluid balance in the body. Micturition involves the contraction of smooth muscles of the bladder and relaxation of the urethral sphincter, contrary to option C. Urine primarily contains urea, not ammonia, as the main nitrogenous waste, making option D incorrect.
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