Breathing Muscle Below the Lungs and Heart
This page is the CodyCross answer for the clue below from Time for a check-up, Group 1708, Puzzle 1 (Private Room).
Question is: Breathing Muscle Below the Lungs and Heart
and the answer is: DIAPHRAGM
Word Meaning:
DIAPHRAGM — (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs.
Definitions from Wiktionary.