78.6% of all the gas in our atmosphere is nitrogen, right? So that means 78.6 per cent of that 760 millimeters of mercury. Percentage how much? What do you reckon? It's well in the 70s. The rest are trace gases. Don't worry about them. We've got this 78.6 for nitrogen, 20.9 for oxygen, 0.04% of carbon dioxide. I'm going to breathe in. Correct, though. What is it doing? I'll tell you in a sec. Let's just say nitrogen, 78.6%. Not much at all.
If you want to learn more about the respiratory system, watch Dr Mike on his youTube channel!
Overview of the Respiratory System
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