NTDT200 Lecture Notes - Lecture 3: Salivary Gland, Small Intestine, Lipase
11 Sep 2018
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Cells: smallest functional unit of living organisms. Tissue: collection of cells with similar origin, organized to form organs. Organ system: group of organs that function together. Digestion: the process of breaking down food into its smallest units in order for nutrients to be absorbed. Vitamins and minerals are released during digestion. Gi tract is 26 to 30 feet (from mouth to anus) Digestion food mechanically/chemically broken down into absorbable units. Absorption substances taken from the gi tract into the body. Most digestion and absorption takes place in the small intestine. Excretion undigested material and other waste eliminated by the body. It takes 24-72 hours for food to pass through the digestive tract. Salivary glands secrete saliva to lubricate food and produce digestive enzymes. Liver makes bile for fat digestion. Pancreas produces enzymes to digest carbs, neutralize stomach acids, breaks down protein. Taste buds identity or sense foods on the basis of specific flavors to prepare gi tract for digestion.
