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Digestive Web - The Digestive System Figure 14.1 Ingestion...

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Unformatted text preview: The Digestive System Figure 14.1 Ingestion — taking in food Digestion — breaking food down physically and chemically Absorption — movement of nutrients into bloodstream Defecation — rids body of indigestible waste Organs of the Digestive System Two main groups Alimentary canal (gastrointestinal or GI tract) — continuous coiled hollow tube Accessory digestive organs – tear and crush food (teeth) or secrete enzymes into lumen Organs of the Alimentary Canal, i.e. the tube… Mouth Pharynx Esophagus Stomach Small intestine Large intestine Anus Accessory Digestive Organs Teeth – mash up food mechanically Salivary glands Pancreas Liver Gallbladder Secrete stuff into ‘the tube’ Mouth (Oral Cavity) Figure 14.2a Entrance to digestive system Food moistened w/ saliva and masticated (chewed) bolus = ball of moistened food Starch (polysaccharide) digestion starts Baby (deciduous) and Permanent Teeth Figure 14.9 Teeth: incisors bite; canines tear; molars grind (32 adult; 20 juvenile) Salivary glands secrete saliva into oral cavity… Saliva = mix of mucus and serous fluids Contains enzymes that digest starch Dissolves chemicals for taste binds and lubricates food ( bolus ) …back to ‘the tube’!! Deglutition (Swallowing) keep your eye on the epiglottis!...
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Digestive Web - The Digestive System Figure 14.1 Ingestion...

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