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>intercostal muscles contract, expanding lungs
>pressure drops below atmospheric pressure, causing air to be pushed into any open orifice between the lungs and the atmosphere until pressure is balanced
>alveoli exchange co2 for oxygen until multiple sensory systems, including blood ph and pO2, detect that it's time for fresh air
>muscles contract, causing an increase of pressure until it's higher than atmospheric pressure and air is forced out of your lungs
You don't suck air into your lungs. The atmosphere forces it's way into you. You're getting raped by the fucking air every second of every day. You little bitch.
