Digestion - l Stopping of breathing l Bolus reaches the...

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Digestion
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Chemical digestion ¢ Digestive enzymes l Proteins l Catalysts l Hydrolytic enzymes or hydrolases l Highly specific in action
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Figure 23.33a
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Figure 23.33b
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Physical digestion ¢ Deglutition ¢ Buccal phase l Voluntary l Compression of the bolus against the hard palate l Retraction of the tongue l Elevation of the soft palate to close the nasopharynx l Propelling of the food to the oropharynx
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Physical digestion ¢ Pharyngeal-esophageal phase l Involuntary l Begins with the swallowing reflex l Pharyngeal contraction l Closing of the glottis by the epiglottis
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Unformatted text preview: l Stopping of breathing l Bolus reaches the esophagus l Peristaltic movements take the bolus to the stomach Physical digestion Peristalsis l Waves of contraction alternated with waves of relaxation of the GI wall l They propel the food through the digestive tract Physical digestion Segmentation l Rhythmic local constriction of the organ wall l Mixes the chyme with digestive enzymes l Increases the rate of food absorption...
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Digestion - l Stopping of breathing l Bolus reaches the...

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