Gas Exchange in the lungs Crossword

This printable crossword puzzle on the topic of Human Body Systems has 12 clues. Answers range from 7 to 11 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Windpipe
Decrease the volume in the lungs when they contract
The intercostal muscle that are responsible for air entering lungs
Air taken in during a normal breath
The process by which air is drawn into lungs
The process by which air from the lungs enters body cells
Breathing passages
Air sacs
Protein that helps to keep airways open
Branching subdivisions
When pressure increases and volume decreases
The process by which air is transported into the lungs