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What is the definition of urination?

  1. Discharge of stomach acid

  2. Discharge of urine

  3. Discharge of blood

  4. Discharge of sweat

The correct answer is: Discharge of urine

The definition of urination refers specifically to the process of discharging urine from the body. Urine is a liquid waste product that is produced by the kidneys as they filter waste and excess substances from the blood, which is then stored in the bladder until it is expelled. This biological process is an essential function for maintaining the body's balance of fluids and electrolytes. Other processes mentioned, such as the discharge of stomach acid, blood, or sweat, involve different organs and systems and do not pertain to the urinary system. Therefore, identifying the process of urination as the discharge of urine is accurate and aligns with the biological understanding of this function.