week4-EGG

week4-EGG - The Electrogastrogram (EGG) H34:...

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The Electrogastrogram (EGG) H34: Electrogastrogram from human subjects
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Gastric System Gastrointestinal Tract Accessory organs (salivary glands, liver, gallbladder and pancreas)
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Peristalsis is the rhythmic contraction of smooth muscles to propel contents through the digestive tract. In much of the gastrointestinal tract, smooth muscles contract in sequence to produce a peristaltic wave which forces a ball of food (called a bolus while in the esophagus and gastrointestinal tract and chyme in the stomach) along the gastrointestinal tract. Esophagus Stomach Peristaltic wave
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Electrical Activity of Gastrointestinal Smooth Muscle The smooth muscle of the gastrointestinal tract is excited by almost continual slow, intrinsic electrical activity along the membranes of the muscle fibers. This activity has two basic types of electrical waves: (1) slow waves (2) spike Membrane potential (mV) Smooth muscle tension - 60 Time Membrane depolarization
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Slow Waves Most gastrointestinal contractions occur rhythmically, and this rhythm is determined mainly by the frequency of so-called "slow waves" of smooth muscle membrane potential. These waves are not action potentials. Instead, they are slow,
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This note was uploaded on 11/14/2011 for the course ECE 3820 taught by Professor Wang during the Fall '11 term at GWU.

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week4-EGG - The Electrogastrogram (EGG) H34:...

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