notes 5 - Digestive System The organs are divided into 2...

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Digestive System - The organs are divided into 2 main groups - Gastrointestinal (GI) tract: - Accessory structures: are the teeth, tongue, salivary glands, liver, gallbladder, & pancreas Mouth - Adapted to receive food & begin preparing it for digestion - Formed by cheeks, palates, lips & tongue. - Starch digestion begins in the mouth Kinds of Teeth - Tooth consists of: - Crown - which projects beyond the gums. Is covered by glossy, white enamel - Dentin - beneath the enamel - Pulp - (cavity) which contains blood vessels, nerves & connective tissue - Root - which is anchored to the jaw Major Salivary Glands 1. Parotid glands - secrete saliva rich in amylase, which begins the digestion of carbohydrates 2. Sublingual glands - Primarily secrete mucus - roof of mouth; gives food the slimy stringyness 3. Submandibular glands - produce saliva that is more viscous - thicker, lubricates the food (as to not stick in throat) Introduction - Digestive : means the breakdown of food by enzymatic action - Chemical & mechanical breakdown of food - Functions: - Ingestion of food
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