In the urinary system, which organ is primarily responsible for filtering the blood to form urine?

• A. Urinary bladder
• B. Kidneys
• C. Ureters
• D. Urethra

Answer: (B)

Verified step by step guidance

1. Understand the main function of each organ listed in the urinary system: the urinary bladder stores urine, the ureters transport urine from the kidneys to the bladder, and the urethra expels urine from the body.
2. Recall that the process of filtering blood to form urine involves removing waste products and excess substances from the bloodstream.
3. Identify which organ contains specialized structures called nephrons, which are responsible for filtering blood and producing urine.
4. Recognize that the kidneys contain millions of nephrons that filter blood plasma, reabsorb needed substances, and secrete wastes into forming urine.
5. Conclude that the kidneys are the primary organs responsible for filtering the blood to form urine.