The Digestive System

Processing of food
Types
Mechanical (physical)
Chew
Tear
Grind
Mix
Chemical
Catabolic reactions
Enzymatic hydrolysis

Digestion

Phases
Ingestion
Movement
Digestion
Absorption
Further digestion


Digestive System Organization

Gastrointestinal (Gl) tract (Alimentary canal)
Extends from mouth to anus
9 m long
Structures
Mouth
Oral Cavity
Pharynx
Esophagus
Stomach
Small intestine ( duodenum, jejunum, ileum)
Colon (ascending, transverse, descending, sigmoid


Deglutition (swallowing)

Control
Nerves
Glossopharyngeal
Vagus
Accessory
Brain stem
Deglutition center
Disorders
Dysphagia
Aphagia

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