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I ran into this line the kaplan book on digestion: the body of the esophagus lies within a negative thoracic cavity and abdominal cavity has a positive pressure gradient. So without normal defense mech, the pressure will favour reflex.
I am utterly confused on this. What do they mean by positive pressure gradient? Does the negativie thoracic cavity mean negative pressure? How do these 2 related?
thank you
I am utterly confused on this. What do they mean by positive pressure gradient? Does the negativie thoracic cavity mean negative pressure? How do these 2 related?
thank you