Respiratory System Crossword

This printable crossword puzzle on the topic of Human Body Systems has 12 clues. Answers range from 6 to 19 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Carries oxygenated blood to the heart
Tubes that carry air closer to the sight of external respiration
Brings blood from the heart into the lungs
Tiny blood vessel through which gas exchange takes place
Tiny air sac through which the gas exchange of external respiration takes place
dome-shaped muscle that separates the thoracic and abdominal cavities
Passages through which air spreads through the lungs
Windpipe
Voice box, contains the vocal cords
Flap of tissue that closes over the trachea when you swallow
Oxygen moves from the lungs into the blood, the carbon dioxide moves from the blood into the lungs
Oxygen moves from the blood into the cells, and carbon dioxide moves from the cells into the blood