AP BIOLOGY

Detailed explanation-1: -Several collecting ducts unite together to form medullary rays. These open into the medulla of the kidney. 4. The medulla consists of a few cone-shaped or pyramid-shaped masses called medullary pyramids which project into the calyces (minor calyx and then to major calyx).

Detailed explanation-2: -Collecting ducts descend through the cortex and medulla and successively fuse near the inner medullary region. Toward the papillary tip, converging papillary ducts form approximately 20 large ducts, which empty into the renal pelvis.

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: -Explanation: Peritubular capillaries, collecting ducts, and loop of Henle are the integral parts of the renal pyramid.

Detailed explanation-5: -Papillary duct Papillary (collecting) ducts are anatomical structures of the kidneys, previously known as the ducts of Bellini. Papillary ducts represent the most distal portion of the collecting duct. They receive renal filtrate (precursor to urine) from several medullary collecting ducts and empty into a minor calyx.