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The Anatomy and Physiology of the Respiratory System

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Submitted By kristof429
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In the nasal cavity, there are three little bumps. Now those three little lumps are called the superior, middle, and inferior meatuses. If you remember back to API when you studied the skull and you looked inside of the nasal cavity, there were three little bones on the left and right of the perpendicular plate of ethmoid. And those were the superior, middle, and inferior conchae. So those little lumps you're looking at are the conchae that you learned about before, but they're just covered with tissue. So in this instance, we're calling them meatuses. And the job of those meatuses is to almost act as though they're speed bumps. So as soon as you sucked the air in through our nostrils, the air will get caught around the meatuses. It slows the air flow down. And when it slowed the air flow down, it will allow time for the nasal cavity to filter and humidify the incoming air. Because the air in our environment is much drier than the inside of our body. So when we breathe air in, if we didn't humidify a little bit, it would potentially dry out our nasal passages. So as soon as we breathe the air in, the nasal cavity will moisten it up, filter it, and then send it down to the deeper parts of the respiratory tract. So again, those meatuses act as sped bumps. They're going to kick up turbulence in the air to sallow us to filter and humidify better. And we know that the air we take in is humidified because if breathed into your hand. And next we have the hard and soft palate, which you should still be familiar with from API. The hard palate if what we call the roof of our mouth. And the palate here is made up of the maxillary bone and the palatine bone. And then hanging off the hard palate, we have the soft palate, which is made up of cartilage. That's why it's called soft because it's much more flexible. Hard palate, maxillary bone and palatine bone. And then soft…...

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