1. Which of the following organs in the human body eliminates wastes and helps maintain salt and water balance?
Answer: D
The kidney eliminates wastes and helps maintain salt and water balance in the human body.
The kidneys play a crucial role in filtering waste products from the blood and regulating the body's fluid and electrolyte balance. They are essential for excretion and homeostasis.
A) Liver
The liver is primarily responsible for detoxifying chemicals, metabolizing drugs, and producing bile for digestion. While it processes waste products, it does not directly eliminate waste or regulate salt and water balance like the kidneys do.
B) Spleen
The spleen is involved in filtering blood and managing the immune response by recycling iron and storing blood cells. It does not play a significant role in waste elimination or maintaining fluid balance in the body.
C) Gallbladder
The gallbladder stores bile produced by the liver to aid in fat digestion. It does not have any functions related to waste elimination or the regulation of salt and water balance.
D) Kidney
The kidneys are the primary organs responsible for filtering blood, removing wastes, and maintaining the body's salt and water balance. They accomplish this through processes such as filtration, reabsorption, and secretion, making them essential for homeostasis.
Conclusion
The kidney is the definitive organ that eliminates wastes and maintains salt and water balance in the body, while the liver, spleen, and gallbladder serve different functions that do not directly relate to these processes. Thus, option D is the correct answer, as it directly addresses the question's requirements.