The diagram shows some structures associated with human excretion. Which structure excretes urea?
▶️ Answer/Explanation
Ans: A
In the human excretory system, urea is primarily excreted by the kidneys (structure A in the diagram). The kidneys filter blood, remove waste products like urea, and produce urine.
Other structures shown (likely the liver, lungs, and skin) have different excretory roles:
– Liver processes urea but doesn’t excrete it directly
– Lungs excrete carbon dioxide
– Skin excretes water and salts through sweat
Since the question specifically asks about urea excretion, the correct answer is A (kidneys).
Which organ is responsible for the excretion of urea in the human body?
▶️ Answer/Explanation
Ans: A
The kidneys (A) filter urea from the blood and excrete it as urine. Urea is a nitrogenous waste product formed in the liver from protein metabolism.
While the lungs (B) remove CO2, the liver (C) produces urea but does not excrete it, and the skin (D) excretes sweat (water and salts). Thus, the primary organ for urea excretion is A (kidneys).