a: small intestine ~
b: long, coiled tube

What:

"The small intestine is like a long, coiled tube. The center of that tube, the lumen, is filled with food material and bacteria that normally don't cause disease. It's protected from harmful pathogens by a layer of mucus secreted from goblet cells. "


Useful?
Writer: Jim Dryden
LCC: QP
Where:
Date: Jan 26 2015 7:24 PM


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