A-side and B-side. The terms A-side and B-side refer to the two sides of 78, 45, and 33 1/3 rpm phonograph records, whether singles, extended plays (EPs), or long-playing (LP) records.
The two ureters connect to either side of the top of the bladder, which is the organ that stores urine until it is expelled from the body. Urine is expelled from each kidney into its respective ureter. Once it enters the ureters, peristalsis moves the urine down the tube and into the bladder.
Each ureter is a muscular tube about 10inches (25 cm) long. Muscles in the walls of the ureters send the urine in small spurts into the bladder, (a collapsiblesac found on the forward part of the cavity of the bony pelvis that allows temporary storage of urine).