Human Body systems Crossword

This printable crossword puzzle on the topic of Human Body Systems has 15 clues. Answers range from 3 to 13 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

What structure keeps the windpipe open?
Which structure is also known as the trachea?
Thw trachea branches into each lung, these tubes are known as?
Tiny holed tubes that travel all through the lungs?
Tiny sacs that allow the exchange of oxygen and carbon dioxide to the bloodstream?
The top chambers of the heart are called?
These structures prevent the backflow of blood in the heart?
The bottom chambers of the heart are called?
These structures protect the lungs?
The arteries have a thick muscular?
Ateries transport blood under high?
Veins have a wide chamber and they transport blood under this pressure?
Capillaries are only one cell?
Oxygen diffuses from the lungs into what part of the blood?
This gas diffuses from the blood into the alveoli that eventually will be exhaled?