Part of the Peripherals glossary: ATAPI (AT Attachment Packet Interface) is an interface between your computer and attached CD-ROM drives and tape backup drives. Most of today's PC computers use the standard Integrated Drive Electronics (IDE) interface to address hard disk drives.art of the Peripherals glossary: ATAPI (AT Attachment Packet Interface) is an interface between your computer and attached CD-ROM drives and tape backup drives. Most of today's PC computers use the standard Integrated Drive Electronics (IDE) interface to address hard disk drives.
Urine is formed in the kidneys, specifically by the renal tubules in the nephrons of the kidneys. It then is collected by the renal pelvis, where it exits though the ureters, moves to the bladder where it is stored until urination, during which it is expelled through the urethra.
As it fills, however, the bladder continually changes shape until it resembles a pear. During storage, urine is held within the bladder by a ring of muscles at the bottom of the bladder (the urethral sphincter), which remains shut and increasingly tightens as the bladder fills.