Which organ in the excretory system filters blood?
Urethra
Bladder
Kidney
Ureter
The kidney filters blood in the excretory system.
The organ in the excretory system that filters blood is the kidney.
The organ in the excretory system that filters blood is the kidney.
To arrive at this answer, we can break down the options and understand their roles in the excretory system:
1. Urethra: The urethra is not involved in filtering blood. It is the tube that carries urine from the bladder to the outside of the body.
2. Bladder: The bladder is a muscular organ that stores urine until it is ready to be eliminated. It does not filter blood.
3. Kidney: The kidneys are responsible for filtering waste materials, toxins, and excess water from the blood to produce urine. They are the main organs of the excretory system and play a crucial role in maintaining the body's water balance and removing waste products.
4. Ureter: The ureters are two narrow tubes that transport urine from the kidneys to the bladder. They do not filter blood.
Therefore, considering the functions of each organ, the kidney is the correct answer as it filters blood to produce urine.