AP BIOLOGY

Detailed explanation-1: -Tubular fluid passes through the collecting ducts to reach the calyces and renal pelvis. While traveling through the collecting ducts, the composition of tubular fluid undergoes alterations. These alterations pertain primarily to reabsorption and secretion of electrolytes, acid, and water.

Detailed explanation-2: -The area at the center of the kidney. Urine collects here and is funneled into the ureter, the tube that connects the kidney to the bladder.

Detailed explanation-3: -Secretion occurs in the proximal tubule section of the nephron and is responsible for the transport of certain molecules out of the blood and into the urine.

Detailed explanation-4: -The name reflects that each renal pelvis collects urine from the calyces and funnels it into the ureter like a wash basin collects water and funnels it into a drain pipe.

Detailed explanation-5: -The central region of the kidney contains the renal pelvis, which is located in the renal sinus, and is continuous with the ureter. The renal pelvis is a large cavity that collects the urine as it is produced. The periphery of the renal pelvis is interrupted by cuplike projections called calyces.