digestion: what your body does with food unit 1 topic 6
TRANSCRIPT
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Digestion:What your body does with food
Unit 1 Topic 6
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CATALYST:
Can you match a letter to the following body parts:
Small intestine
Esophagus
Stomach
Large intestine
Liver
Pancreas
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Stages of food processing
• Ingestion
• Digestion– Mechanical
– Chemical
• Absorption
• Elimination
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Mouth (oral cavity)
• Functions– mechanical digestion– chemical digestion– Saliva also contains…
• mucus • buffers • anti-bacterial chemicals
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Swallowing
• Epiglottis
• Peristalsis
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Stomach• Functions
–disinfect food–food storage–digests protein–mechanical digestion
But the stomach cells contain protein!What stops the stomach from digesting itself?
mucus secreted by stomach cells protects stomach lining
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Small intestine• Functions
– Chemical digestion– Absorption
This iswhere all thework is done!
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Absorption in Small Intestines• Absorption through villi & microvilli
SMALL INTESTINES6 meters long,but can stretchto cover a tennis court
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Accessory organ: Pancreas • Produces digestive enzymes that
function in the small intestine for chemical digestion
• Also produces buffers
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Accessory organs: Liver & Gall Bladder
• Liver produces bile• Gallbladder stores bile
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• Function– re-absorbs water– compact waste for elimination
Large intestines (colon)
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You’ve got company!• Living in the large intestine is a
community of helpful bacteria– Escherichia coli: E. coli
• digest cellulose
• produce vitamins – vitamin K & B vitamins
• BUT generate gases– by-product of bacterial metabolism – methane, hydrogen sulfide
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