Respiratory system
The respiratory tract conducts air from the nose and mouth through the larynx, trachea and bronchi to the lungs, where gas exchange takes place in the alveoli.
The atlas models this system as interactive 3D geometry (toggle it in the Systems panel).
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Common questions
Which muscle is most important for breathing?
The diaphragm is the main muscle of inspiration, assisted by the intercostal muscles and accessory muscles during heavy breathing.