Respiratory System Crossword

This printable crossword puzzle on the topic of Human Body Systems has 13 clues. Answers range from 3 to 11 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Animals need this to create energy
Layer of muscles that sits beneath the lungs
Passages that branch from the trachea and direct air into the lungs
This contains vocal chords
Tubule that forms the respiratory system of most insects
Tiny sacs of lung tissue that move gases between air and blood
A membrane has to be ______ in order for oxygen to pass through it
The _______ gland, covers the trachea
The ribs are attached to this flat bone
The exchange surfaces of fish gills are arranged as rows of _________.
The opening to the tracheal system in insects is the _______.
The _______ muscles contract during inhalation to bring air into the lungs
_______ receptors are located in the brain-stem to monitor the partial pressure of oxygen