Biology Gas Exchange Crossword

This printable crossword puzzle on the topic of Human Body Systems has 15 clues. Answers range from 5 to 13 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

The muscles in-between the ribs. (11)
AKA wind pipe (7)
Fluid that reduces friction when the lungs make respiratory movements. (7,5)
Allows air to reach lungs - about 5cm long. (6)
Prevents food from entering the lungs. (10)
branch subdivision in the lungs (11)
Hair-like pieces that cover the inside of the trachea (5)
Contracts and flattens when you breathe. (9)
increasing the volume in the chest cavity decreases the what? (8)
a disease caused by damaging products that are inhaled into the lungs. (9)
General term for the chemicals in cigarettes. (11)
Untreated coronary heart disease can cause ...? (7,6)
coughing causes (already) damaged alveoli walls to ...? (10)
What is produced in the trachea to clean it? (5)
clean alveoli means an increase in what? (7,4)