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Human Alimentary Canal

Human Alimentary Canal. Grade 8 Semester 1 Year 2011-2012. Nutrition. There are two parts to Nutrition: 1. Ingestion -process of taking food into the digestive system so that it may be hydrolized or digested.

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Human Alimentary Canal

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  1. Human Alimentary Canal Grade 8 Semester 1 Year 2011-2012

  2. Nutrition There are two parts to Nutrition: 1. Ingestion-process of taking food into the digestive system so that it may be hydrolized or digested. 2. Digestion- the breakdown of food (either chemically or mechanically) in order to utilize nutrients.

  3. Human digestive system

  4. Mouth • Chemical and mechanical digestion. • Food is chewed mechanically. • A bolus (lump) is formed with saliva and the tongue.

  5. Peristalsis • series of involuntary wave-like muscle contractions which move food along the digestive tract

  6. Stomach • Food is temporarily stored here. • Gastric juices are secreted. • Has layers of muscle that line the inside. • Mechanically and chemically breaks down food.

  7. Gastric Juices • Secreted by the stomach. • Acidic (pH 1.5-2.5) (HCl). • Pepsin- an enzyme that breaks down large proteins into aminoacids. • Food is further broken down into a thin liquid called chyme.

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