Digestive System

Functions/Processes of the Digestive System

Most contractions are rhythmic which are triggered by frequencies of “___” membrane potential in smooth muscle of the GI tract.

The cause of slow waves is not known entirely but it is thought that specialized cells called “____” act as pacemaker cells for the smooth muscle.

When slow waves reach -40mV a __ (action potential) is generated

__ channels open and close slowly causing spike potentials to have long durations (10-20ms): Depolarization occurs.

Factors that make the resting membrane potential more positive include:

Factors that make the resting membrane potential more negative include:

Two Plexuses

The myenteric plexus controls __

The submucosal plexus controls __

G cells produce __

I cells of the small intestine release __

S cells of the small intestine release __

basic propulsive movement of the GI tract

Parietal cells secrete __

Chief cells secrete __

Phases of Pancreatic Secretion