Gut Anatomy

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Mouth: chew, saliva, amylase

Esophagus: mouth to stomach

Stomach: food to liquid, pH <2, enzyme digest proteins

Small Intestine: Duodenum, Jejunum, ileum, H2O absorb, chem enzyme digestion, nutrient absorb

Large Intestine: Descending, Transverse, Ascending, Simgoidal colon, H2O absorb, bacteria, feces

Rectum: feces storage

Anus: defecation control

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Neurotransmitters

Ach: increase GI motility and pancreas secretion

Serotonin-5HT-N/v, secretion/bowel motility

Histamine: Gastric acid, intestine motility

Dopamine: appetite, emotion, endocrine, hormone, vascular tone, motility

NO: epithelial secretion, vasodilation, smooth muscle relaxation, kill invaders

NE: Decrease GI contraction, intestine blood flow, secretion control

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