BIG IDEA The digestive system: provides nutrients energy for
your body through the digestion of food THE DIGESTIVE SYSTEM
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Objective Students will learn: How the digestive system
provides nutrients and energy to the body through the digestion of
food.
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What happens During Digestion? Main Idea: During digestion,
foods are broken down and absorbed as nourishment or eliminated as
waste. Digestion Mechanical breakdown of foods within the stomach
and intestines for use by the bodys cells. Absorption Passage of
digested food from the digestive tract into the cardiovascular
system Elimination The bodys expulsion of undigested food or body
waste
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How Digestion Works Main Idea: The digestion system consists of
the mouth, esophagus, stomach and intestines. Mouth--teeth,salivary
glands, tongue Esophagusmuscular tube about 10 inches long that
connects the pharynx with the stomach Stomachhollow sac organ
enclosed in a wall of muscles. These muscles are flexible and
allows the stomach to expand when you eat. Intestinespancreas,
liver and gallbladder, small and large intestines.
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Esophagus Muscular tube 10 inches long Connects pharynx with
the stomach Peristalsispare-ih-STAWL-suhsvoluntary muscle
contractions that moves food through the digestive tract.
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The Stomach Hallow Sac-like-organ Flexible muscles Stomach
expands 3 tasks1. Mixing foods with gastric juices2.Storing
partially digested food and liquid3. Moving food into the small
intestines 3 layers in stomach muscles
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The Pancreas, Liver and Gallbladder Pancreas produces enzymes
Liver produces bile Glands in walls of intestine
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The Small and Large Intestine Small IntestineLarge Intestine
20-23 feet in length 1 inch in diameter Consist of 3 parts:
duodenum jejunumileum Digestives juice secreted from small
intestine, liver and pancreas 90% of all nutrients are absorbed by
small intestine Villifinger-like projection absorb nutrients
5-6-feet long 2.5 feet in diameter Unabsorbed materials move by
peristalsis into large intestine Undigested parts of food-
fiber-roughage is pass into colon Function is to absorb water,
vitamins and salts, and to eliminate waste
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Functional and Structural Problems Functional Indigestion
Constipation Heart burn Gas Nausea Diarrhea Structural Tooth decay
Gastritis Peptic ulcer Gallstones Lactose intolerance Appendicitis
Colitis Colon Cancer Hemorrhoids Crohns disease Cirrhosis
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The Digestive System
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The Stomach
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Good versus Bad (Liver)
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How the Body Work http://kidshealth.org/kid/htbw/
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Human Digestive System http://health.howstuffworks.com/adam-
200142.htm Glencoe Health book pages 422-428
http://kidshealth.org/kid/htbw/