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There are pacemakers located along your GI tract.  We originally learned about pacemakers at the heart.  What is...

There are pacemakers located along your GI tract.  We originally learned about pacemakers at the heart.  What is different regarding how slow-wave potentials and GI contractions occur in comparison to heart pacemakers and heart contractions in general?

science   Anatomy-And-Physiology   
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Answer #1

Just as heart have a pacemaker which maintain constant beating of heart, GI tract also have a pacemaker in the form of interstitial cells of Cajal.

These cells are present at various levels in GIT and maintain a constant slow wave of smooth muscle contraction . This movement is called peristalsis.

Interstitial cells of Cajal are different from SA node(pacemaker of heart) in the fact that activity of SA node is auto regulated. SA node generates its own potential and does not depend on nervous system for its activity. Whereas peacemaker in GIT works under the influence of nervous system and works by releasing neurotransmitters.

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