The part of the kidney tubule where ultra filtration takes place is the

Step 1: Analyze the question The question asks where ultrafiltration happens in the nephron (the functional unit of the kidney).

Step 2: Explain the concept Ultrafiltration is the first stage of urine formation. Blood is filtered under high pressure, so small molecules are forced out of the blood into the nephron. The process happens in the renal corpuscle, which is made up of:

• Glomerulus: a knot of capillaries. The afferent arteriole is wider than the efferent arteriole, which builds up high pressure.
• Bowman's capsule: a cup-shaped structure surrounding the glomerulus, which collects the filtrate.

Water, glucose, amino acids, salts, and urea pass through into the capsule. Blood cells and large proteins stay behind because they are too big.

Step 3: Go through the options

• A. Bowman's capsule: Correct. Filtration occurs here, between the glomerulus and the capsule.
• B. Distal convoluted tubule: Fine-tunes salt and water balance (selective reabsorption and secretion).
• C. Henle's loop: Creates a concentration gradient for water reabsorption.
• D. Main collecting tubule: Final water reabsorption, controlled by ADH.
• E. Proximal convoluted tubule: Reabsorbs most of the glucose, amino acids, and much of the water and salts.

Step 4: Answer Ultrafiltration takes place at the Bowman's capsule (with the glomerulus), which is option A.

Tip: Remember the order of the nephron with this phrase: "Big GirlsProudly Learn Dancing Cool": Bowman's capsule (filtration) → Glomerulus → Proximal tubule (reabsorption) → Loop of Henle (concentration) → Distal tubule (adjustment) → Collecting duct (water). Filtration comes first, and "filtration" means "Bowman's".