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(Critical) This program presents laboratory experiments and a discussion of the frequency gradient of contractions in the rat small intestine in vitro. The role of sodium, calcium, and acetylcholine are discussed in relationship to the mechanical electrical activity in the small intestine. Although the presentation is generally well done, some deficiencies exist such as a lack of a thorough explanation of the electrical basis for contractile activity in the small intestine and its relationship to the frequency gradient. Thus, the program is recommended with reservations for medical students specializing in gastroenterology. and Gastrointestinal motility is defined by the movements of the digestive system and the transit of the contents within it. In this video, the presenter provides the viewers with laboratory data on different perspectives for understanding GI motility. Sodium and calcium both play major roles in the muscular activity of the GI gradient. Various graphs demonstrating electrical rhythm in the gastrointestinal tract are shown throughout the video.
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