Membranous Sac That Can Be Filled With Air or Gas
This page is the CodyCross answer for the clue below from Making a Documentary, Group 1502, Puzzle 1 (Director and Actors).
Question is: Membranous Sac That Can Be Filled With Air or Gas
and the answer is: BLADDER
Word Meaning:
BLADDER — (zoology) A flexible sac that can expand and contract and that holds liquids or gases.
Definitions from Wiktionary.