respiration Crossword

This printable crossword puzzle on the topic of Human Body Systems has 12 clues. Answers range from 5 to 11 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

What in the lungs have very thin walls and a large surface area
What branch into smaller and smaller blood vessels in side your organs
What _ attack causes the airways to become narrow
What branches into two at the end of the trachea
the smallest blood cells are called what
what our body is made up of
what is the domed-shaped sheet of muscle across the bottom of your rib cage called
what muscle beats regularly
to breath in
your ribcage protects your
the air we breath contains
the air pipe is called the ...