Q: What is the last part of the nephron?  

Answer: A

The collecting duct is the last part of the nephron, which is a part of the kidney responsible for filtering blood and producing urine. The collecting duct receives urine from the distal convoluted tubules of several nephrons and moves it through the renal pyramid to the renal papilla. The renal papilla is the site where urine is drained into the minor calyx, and eventually the major calyx, renal pelvis, and ureter. The collecting duct also plays an important role in the reabsorption of water, which is regulated by the hormone vasopressin (also known as antidiuretic hormone). Overall, the collecting duct plays a crucial role in the kidney's ability to maintain the body's fluid balance and eliminate waste products.

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