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This video deals with the first part of chapter 63 of the Guyton & Hall medical physiology treatise. CONTENT: 1. General principles of gastrointestinal function. 2. General principles of gastrointestinal motility. 3. Physiological anatomy of the intestinal wall. 4. Electrical activity of gastrointestinal smooth muscle. 5. Slow waves. 6. Spike potentials. 7. Tonic contraction. 8. Nervous control of gastrointestinal function: enteric nervous system. 9. Differences between the myenteric and submucosal plexuses. 10. Types of neurotransmitters secreted by enteric neurons. 11. Autonomic control of the gastrointestinal tract. 12. Gastrointestinal reflexes.