Which component is responsible for filtering blood in the urinary system?

The kidneys are the primary structures responsible for filtering blood in the urinary system. They play a crucial role in maintaining homeostasis by regulating the composition of blood, including the removal of waste products and excess substances. Blood enters the kidneys through the renal arteries, where it undergoes filtration via nephron units. This process involves the removal of waste products, excess salts, and water, which are then converted into urine.

The urethra, bladder, and ureters are involved in the transportation and storage of urine, but they do not perform the essential function of blood filtration. The urethra carries urine from the bladder to the outside of the body, the bladder serves as a reservoir for urine, and the ureters transport urine from the kidneys to the bladder. Thus, the kidneys are the only component mentioned that has a filtering capability for blood.