2. Homeostatic regulation of pH through the regulartion of CO2
3. Protection from inhaled pathogens and irritating substances
___________ provides a passage way for CO2 to come in or out, while ______ is where gas exchange occurs.
4. Could you follow a molecule of oxygen from the external environment all the way to a red blood cell in the capillary near an alveolus? Conversely, could you describe the pathway for a molecule of carbon dioxide from the internal environment out the nares?
What is the functional unit of the lung?
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