20. Which of the following organs removes nitrogenous waste from the body?
Answer: C
The kidneys remove nitrogenous waste from the body.
The kidneys are responsible for filtering blood and excreting nitrogenous waste products, such as urea, through urine. This vital function helps maintain the body's chemical balance and prevent the accumulation of harmful substances.
A) Gallbladder
The gallbladder is primarily involved in the storage and concentration of bile, which aids in the digestion of fats. It does not play a role in the removal of nitrogenous waste from the body, making this option incorrect.
B) Liver
While the liver processes nitrogenous waste and converts ammonia into urea, its primary function is not the excretion of waste. The liver synthesizes urea, but it is the kidneys that are responsible for removing it from the bloodstream and excreting it through urine.
C) Kidneys
The kidneys are the main organs responsible for filtering blood to remove nitrogenous waste products, such as urea and creatinine. They play a crucial role in homeostasis by regulating fluid balance, electrolytes, and waste elimination.
D) Large intestines
The large intestines primarily function in the absorption of water and electrolytes, as well as the formation and excretion of feces. They do not have a role in the removal of nitrogenous waste, which is why this option is incorrect.
Conclusion
The kidneys are definitively the correct answer as they directly filter and excrete nitrogenous waste from the bloodstream. The other options, while important for various bodily functions, do not contribute to the removal of nitrogenous waste, highlighting the specialized role of the kidneys in this critical process.