Anatomy and Cell Biology 3319 Lecture Notes - Lecture 3: Loose Connective Tissue, Food Processor, Duodenum
23 Jun 2016
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Document Summary
Gi tract is about 30 feet long (in a dead body when muscles are all relaxed, but shorter in vivo) Throughout the length of gi tract the wall is raised in 4 layers. Upper digestive tract: mouth to level of duodenum (in red box) Mostly involved in ingestion (taking food in, masticating food, swallowing, and movement of. Once food is in stomach, it resides there for a while the stomach churns it with digestive food down the esophagus to stomach via peristalsis) enzymes. Lower digestive tract: si and li, involved in nutrient absorption. Inability to swallow is known as dysphagia then you gag, cough, or choke. Can be caused by cancer at throat/esophagus, stroke, or chemotherapy. Oral stage: food is moved from front of mouth down to the fossae at the back of the throat. Pharyngeal stage: when food moves from oral cavity to pharynx during swallowing. Esophageal stage: involves peristalsis (rhythmic contractions to move to stomach)
