The first step in urine formation is

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(A) Urine formation involves three main processes: $1$. Glomerular filtration (Ultrafiltration): This is the first step where blood is filtered throug

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Ultrafiltration

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(A) Urine formation involves three main processes: $1$. Glomerular filtration (Ultrafiltration): This is the first step where blood is filtered through the glomerulus into the Bowman's capsule. $2$. Reabsorption: Essential substances like glucose,amino acids,and water are reabsorbed from the filtrate back into the blood. $3$. Tubular secretion: Additional waste products like $H^+$,$K^+$,and ammonia are secreted into the filtrate. Therefore,the first step is Ultrafiltration.

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