Anatomy & Physiology · Systems
Lungs & Breathing
How air gets in and oxygen gets to muscles: the airway tree, roughly 480 million alveoli, the diaphragm and pressure changes, gas exchange and hemoglobin, CO₂ as the breathing trigger, ventilation numbers, exercise and lung health.
Step 1 of 6 · Overview25 min read ·
Key idea
Prereqs: Cells, tissues & organs; The heart. Next: Cardio exercise & VO₂ max. Sources: Crash Course A&P #31–32; Ochs et al. (2004) on alveolar number; American Lung Association.Next: 1. Structure