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Option 1 : Kidney
- The Kidneys are located on both sides of the human body.
- The kidneys are bean-shaped organs, located against the back muscles in the upper abdominal area.
- They sit opposite each other on both the left and right sides of the body.
- Each kidney is about 4 or 5 inches long and their role is to filter the blood.
- They remove waste, control the body's fluid balance, and keep the right levels of electrolytes.
- The nephron is the structural and functional unit of the kidney.
- Each human adult kidney contains around 1 million nephrons.
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