Body

BLADDER

The bladder is a hollow, muscular organ that stores urine until it is expelled from the body. It can hold roughly 400 to 600 milliliters and expands as it fills. Stretch receptors in its wall signal the brain when it is time to empty it.

BLADDER is the kind of word that shows up in themed word searches like Strands. Themed puzzles group words like this under a shared category — here, Body.