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Download Digestive system PDF Notes HAP free for Pharmacy students.
Functions of the Digestive System
Ingestion – the oral cavity allows food to enter the digestive tract and have mastication (chewing) occurs , and the resulting food bolus is swallowed .
Mechanical digestion – muscular movement of the digestive tract (mainly in the oral cavity and stomach) physically break down food into smaller particles .
Chemical digestion – hydrolysis reactions aided by enzymes (mainly in the stomach and small intestine)
chemically break down food particles into nutrient molecules , small enough to be absorbed . .
Secretion – enzymes and digestive fluids secreted by the digestive tract and its accessory organs facilitate
chemical digestion .
Absorption – passage of the end – products (nutrients) of chemical digestion from the digestive tract into blood or
lymph for distribution to tissue cells .
Elimination – undigested material will be released through the rectum and anus by defecation .