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Physiology II

 

GI System

-deal w/            Motility

                        Secretion

                        Digestion

                        Absorption

 

Cystic Fibrosis—pancreatic enzyme deficiency

Secretion-enzymes, mucous, water, hormones

 

Law of the Gut—motility is pharynx to analward (peristalsis)

 

Peristalsis—never stops

                    Nausea is the neurologic effect that motility has stopped

 

3 Things enhance peristalsis

1.      stretch/distension

2.      contact

3.      irritation

 

mouth, eosphagus, pharynx, stomach, small intestine, large intestine

 

GI has its own nervous system—Enteric N.S.

2 parts

1.      myenteric plexus (Auerbach’s)—muscle layer

2.      submucosal plexus (Meissner’s)

-these control motility and secretion