ANATOMY

Detailed explanation-1: -The filtrate flows from the proximal tubule and into the Loop of Henle. The loop of Henle concentrates the filtrate, by removing more water from it, and passes it to the distal tubule. From the distal tubule it travels to the collecting duct-now called urine.

Detailed explanation-2: -Answer and Explanation: The filtrate becomes urine in the collecting ducts, thus the correct answer is A). Urine is formed through three processes: filtration, reabsorption, and secretion. Filtration occurs in the renal corpuscle.

Detailed explanation-3: -The kidney glomerulus filters blood mainly based on particle size to produce a filtrate lacking cells or large proteins. Most of the ions and molecules in the filtrate are needed by the body and must be reabsorbed farther down the nephron tubules, resulting in the formation of urine.

Detailed explanation-4: -The third part of the renal tubule is called the distal convoluted tubule (DCT); this part is also restricted to the renal cortex. This last part of the nephron connects with and empties its filtrate into collecting ducts that line the medullary pyramids.

Detailed explanation-5: -At the end of the distal convoluted tubule, the filtrate empties into collecting ducts, where it combines with filtrate from other nephrons. Collecting ducts move back into the medulla, which is salty, so more water leaves through passive diffusion.