Respiratory system Crossword

This printable crossword puzzle on the topic of Human Body Systems has 13 clues. Answers range from 4 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Is breathed out of the lungs
Air is filtered and warmed here
This mosistens the air
Another word for the windpipe
Which blood vessels suround the alvioli?
This happens in the alveoli
The trachea splits into 2 tubes calede?
This muscle contracts to increase the size of the chest cavity
These pull the chest walls up and out
Breating in is called
Breathing out is called
Red blood cells and oxygen combine to form what molecule
Alveoli have a ____ _____ ___ to help exchange gases