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.
The renal pelvis is the area of the kidney that collects the urine and passes it to the ureter. The kidney structures that are responsible for the actual filtering of blood are the nephrons. Nephrons extend through the cortex and medulla areas of the kidneys. There are over a million nephrons in each kidney.he kidneys are popularly described as being bean-shaped and reddish in color. They are located in the middle region of the back, with one on either side of the spinal column. Each kidney is about 12 centimeters long and 6 centimeters wide. Blood is supplied to each kidney through an artery called the renal artery.