How we breathe
Chapter 1
The engine of the breath
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Chapter 2
The gas exchange highway
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Chapter 3
The ultimate cleaning crew
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Chapter 4
Breathing at the extremes
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YOUR GOAL
Master of How we breathe
Ch 1 · The engine of the breath
Fun Fact
Diaphragm movement: Your diaphragm moves down about 1.5 centimeters during normal breathing, but during deep breathing, it can move down up to 10 centimeters.
Glossary
diaphragm (noun)
A dome-shaped muscular partition separating the chest cavity from the abdomen in mammals. This muscle contracts and flattens to draw air into the lungs during inhalation.
A dome-shaped muscular partition separating the chest cavity from the abdomen in mammals. This muscle contracts and flattens to draw air into the lungs during inhalation.
Quiz
How does the nasal cavity prepare cold air before it reaches the delicate human lungs?
Quiz
What is the average volume of a relaxed breath, known as tidal volume, in an adult human?
Quiz
Why does the human trachea have C-shaped cartilage rings instead of complete circles?