Isotopes when written out are common nouns, and should begin with the uncapitalized element name, followed by a hyphen (not an em dash or en dash) and then the mass number. Examples are carbon-14 and uranium-235.
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.
Distal Tubule-In the vertebrate kidney, the portion of a nephron that helps refine filtrate and empties it into a collecting duct. Collecting Duct-The location in the kidney where filtrate from renal tubules is collected; the filtrate is now called urine.reter-A duct leading from the kidney to the urinary bladder. Urethra-A tube that releases urine from the body near the vagina in females and through the penis in males; also serves in males as the exit tube for the reproductive system.