How does the tube work to help you breath during surgery?

For some reason, I am concerned about how I will breathe (comfortably) during the surgery. When I lay back on a firm or new surface...operating table...I do not breathe as easy as in bed or in a recliner. So now we add to the situation a tube down my throat...Is it like a CPAP where it is constant pressure, and I take advantage of it as I breathe in? Or does it force air in and then exhale for me? I just wonder how it works, and especially if there was a conflict. Probably it all happens while I am "under" and nothing will make any difference to me anyway...just something to worry about. Thanks for your comments, Lynn

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