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.

Membranous Sac That Can Be Filled With Air Or Gas - Making a Documentary CodyCross Answers | CodyCross Solutions