I always thought that the nose was designed not only to smell but to filter out dust and toxins from the air entering our respiratory system. If this is the case then why do drugs put up the nose get absorbed into the blood so fast? Shouldn’t the nose have more defences against foreign toxins from entering the blood?
In: Biology
I think it’s a side effect of how mucus membranes are designed for secretion. Like your nose runs when you are sick because your body is trying to expel the pathogens packaged into mucus. So all the blood vessels are there to deliver waste and pathogens to be secreted but the side effect is that it’s also absorptive.
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