Welcome everybody to another episode of Dr. Matt and Dr. Mike's A to the Human Body.

I'm your host, Dr. Mark Todorovich, joined by my co-host, Dr. Matthew Barton.

We are on the letter A, approaching the end-ish of the letter A, I hope, and move on to the B's.

That'll be fun. The term today, Matt,

is alveolar cells type 1. Sometimes they are termed numocytes or type 1 numocytes or just type 1

alveolar cells. Now, we have done an episode on alveoli and alveolus. I recommend everybody

listen to that episode, but as a quick recap, alveoli and alveolus, these are the air sacs at the

ends of our lungs that participate in gas exchange, allowing for oxygen to go from that empty

sack into the blood vessel that lines the outside of this empty sack, and for carbon dioxide

to go from the blood vessel into this empty sack for us to be able to breathe out.

So is it more accurate to say that at the end of the respiratory tract, then at the end

of the lung? Because it's kind of seems that at the end of the respiratory tract that then at the end of the lung,

because it's kind of scenes that you say at the end of the lung,

it would be like pull the lung out and at the end of it.

As in the tip.

Yeah.

Yes.

I suppose at the end of the tract of the respiratory tract,

the, like you said in one of the previous episodes,

it's sort of like the final station.

If you were to travel down, if you were a gas particle and you were to travel through the entire tract, your very last port of call of the respiratory tract would be the alveoli.

And so if we take these lvoli, there's about 480 million of them in both of our

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