ANATOMY

Detailed explanation-1: -A minor calyx surrounds the renal papillae of each pyramid and collects urine from that pyramid. Several minor calyces converge to form a major calyx. From the major calyces, the urine flows into the renal pelvis; and from there, it flows into the ureter.

Detailed explanation-2: -The Ureters Move Urine from the Kidneys to the Bladder Urine drains from the renal pelvis of each kidney into the ureters. The ureters are long, thin tubes made of smooth muscle.

Detailed explanation-3: -The last part of a long, twisting tube that collects urine from the nephrons (cellular structures in the kidney that filter blood and form urine) and moves it into the renal pelvis and ureters. Also called renal collecting tubule.

Detailed explanation-4: -Two ureters. These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys.