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Which organ in the human body is responsible for filtering blood and removing waste products?
Liver
Kidneys
Heart
Lungs
Kidneys
The kidneys are the primary excretory organs responsible for filtering blood and removing metabolic waste products like urea and creatinine. They maintain homeostasis by regulating water balance, electrolyte concentrations, and blood pressure.
The kidneys are the primary excretory organs responsible for filtering blood and removing metabolic waste products like urea and creatinine. They maintain homeostasis by regulating water balance, electrolyte concentrations, and blood pressure.
Think of the kidney as a high-tech water purification plant where polluted water flows in, useful minerals are recovered, and waste is flushed out as concentrated sludge.
K-F-U: Kidneys Filter Urea.
GFR=PcrтАЛUcrтАЛ├ЧVтАЛ тАФ where GFR is Glomerular Filtration Rate, UcrтАЛ is urine creatinine, V is urine flow rate, and PcrтАЛ is plasma creatinine.
The kidney functions through millions of microscopic units called nephrons. Blood enters the glomerulus under high pressure, where water, ions, and small molecules are filtered into the Bowman's capsule. Subsequently, the renal tubules selectively reabsorb essential nutrients and water back into the bloodstream, while concentrated waste is excreted as urine via the process of ultrafiltration and tubular secretion.
The functional unit of the kidney is the nephron.
Kidneys also produce hormones like erythropoietin which stimulates red blood cell production.
The process of cleaning blood is known as hemodialysis when kidneys fail.
Maintains acid-base balance
Regulates blood volume and pressure
Renal clearance tests
Diagnostic analysis of serum creatinine levels
Average human kidneys filter about 180 liters of blood plasma daily.
Option A (Liver) detoxifies chemicals and metabolizes drugs but does not filter blood for liquid waste excretion.
Option C (Heart) is a pump responsible for blood circulation, not filtration.
Option D (Lungs) are responsible for gas exchange (CO2тАЛ and O2тАЛ removal), not nitrogenous waste filtration.
B is correct тАФ Kidneys are specialized organs that extract nitrogenous waste from the blood through the filtration of plasma within nephrons.
In competitive exams, remember that the Liver is for chemical detoxification and nutrient processing, while the Kidneys are strictly for metabolic waste and electrolyte balance.
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