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Question

The mechanism of urine formation in nephron involves_______


A

Ultrafiltration

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B

Reabsorption

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C

Tubular secretion

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D

All of the above

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Solution

The correct option is D

All of the above


There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. These processes ensure that only waste and excess water are removed from the body. Glomerular filtration is the first step in making urine. It is the process that your kidneys use to filter excess fluid and waste products out of the blood into the urine collecting tubules of the kidney, so they may be eliminated from your body. Reabsorption or tubular reabsorption is the process by which the nephron removes water and solutes from the tubular fluid and returns them to the circulating blood. Tubular secretion is usually used to remove drugs, toxins and poisons, or other natural compounds in excessive amounts (such as potassium (K+), hydrogen (H+), and urea).


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