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In Biology / Senior High School | 2025-07-24

Which organ of the urinary system filters waste from the blood?
A. Bladder
B. Ureter
C. Kidney
D. Urethra

Asked by erickadamasco2568

Answer (1)

The answer is C. Kidney The kidneys are vital organs in the urinary system, and their primary function is to filter waste products from the blood. Located on either side of the spine, just below the rib cage, each kidney is about the size of a fist and contains over a million filtering units called nephrons.Each nephron performs three key processes:Filtration – removes waste, excess salts, and water from the blood.Reabsorption – useful substances like glucose, amino acids, and water are returned to the bloodstream.Secretion – additional waste products and toxins are added into the filtrate.The final product of this process is urine, which contains urea, uric acid, water, and various toxins. Urine travels from the kidneys to the bladder via the ureters, and is eventually excreted through the urethra.The kidneys also play roles in:Regulating blood pressure (via the hormone renin).Stimulating red blood cell production (via erythropoietin).Maintaining electrolyte balance (like sodium, potassium, calcium).If the kidneys fail to function properly, waste builds up in the body, leading to serious complications like uremia. Patients with kidney failure may require dialysis or even a kidney transplant.In contrast:The bladder stores urine.The ureters transport urine.The urethra expels urine out of the body.Learning how the kidneys function is essential for understanding human physiology and diseases like kidney stones, UTIs, and hypertension. It also emphasizes the importance of hydration and healthy lifestyle habits for proper kidney function.

Answered by dapperdazzle | 2025-07-25

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