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Digestive System (Digestion (chemical (mouth (saliva), stomach, add…
Digestive System
Digestion
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Peristalsis: adjacent segments alternately contract and relax, moving food along the tract
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Segmentation: nonadjacent segments of tract alternately contract and relax, mixing the food as it's slowly propelled
Mesenteries
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Definition: double layer of peritoneum from body wall to digestive organs; holds organs in place; stores fat; provide place for blood vessels and nerves
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greater omentum: from greater curvature of stomach, draped over intestines; can enclose an inflamed/infected organ
Stomach
General Functions: store food, mechanical digestion, chemical digestion
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Large Intestine
Function
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anal canal: mucus glands for lubrication; internal(smooth muscle) and external(skeletal muscle) sphincters
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Peritoneum
Retroperitoneal
duodenum, pancreas, ascending/descending colon, rectum
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Intraperitoneal
liver, stomach, transverse colon, jejunum, ileum, sigmoid colon
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Small Intestine
structures
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duodenal glands: secrete alkaline mucus to neutralize acid from the stomach and to protect from chemicals
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