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So, where does all the CO₂ come from in the body? Well, CO₂ is a waste product from cells so
even if you covered my mouth I would still be making lots of CO₂ because it's just a by-product
from all the activities of my cells. So that's why someone, if they've stopped breathing for a
while, their CO₂ levels are going to be skyrocketed high because for a while those cells are
going to keep working. So, how would you do? Look back at your notes and how many of the
structures from nose to alveoli were you able to list when you started this video series with
us? Now, pause the video, see how many you can list for memory. Welcome back. Okay, we put
all the answers here for you so I hope you didn't look at these, you tried to remember what
you could do on your own first. Pause and recall is a powerful strategy for reminding your
brain what you just studied and encoding it efficiently so you can recall it when you really need
it like on an exam question or in actual patient care.