The Respiratory System and Spirometer Trace Crossword

This printable crossword puzzle on the topic of Human Body Systems has 11 clues. Answers range from 7 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

What contracts and relaxes to move the rib cage in and out?
What are alveoli covered in?
What are alveoli attached to?
What does oxygen travel down to reach the lungs?
What does oxygen and haemoglobin combine to make?
What sits beneath the lungs and and flattens during inhalation?
What is the name for the amount of air left in the lungs after breathing out as much as possible?
What is the name for the amount of air that can be forced out after normal breathing?
What is the normal amount of air inhaled or exhaled per breath called?
What is the name for the largest amount of air that can be forcibly expired after breathing in as much as possible?
What is the mount of air that can be forced in after normal breathing called?