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.
that is curved to one side is almost completely enclosed in the deep indentation on the concave side of the kidney the sinus the large end of the pelvis has roughly cuplike extensions called calyces within the kidney these are cavities in which urine collects before it flows on into the urinary bladder