Digestive System.

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Presentation transcript:

Digestive System

Digestive System Food must be broken down into nutrients in a form the body can use. The breaking down of food into simpler substances for use by the body is the job of the digestive system. The digestive system is a coiled, muscular tube (6-9 meters long) beginning with the mouth and ending with the anus

Digestion Digestion is the process by which food is converted into soluble forms Digestive System Notes 7th Grade Science Unit 4

Forms of Digestion

Stages of Digestion

Primary Digestive Organs

Peristalsis

Primary Digestive Organs (cont’d) Rectum – temporary storage site for solid waste

Accessory Digestive Organs

Care of the Digestive System Eat foods that are high in fiber like fruits and vegetables Drink plenty of water Chew your food completely before you swallow Avoid foods high in fat

Digestive Disorders A. Ulcers - spot in stomach lining where cells are destroyed, lining unprotected, irritated by stomach acid B. Gastritis - swelling of stomach lining, caused by irritating foods, alcohol, or bacteria C. Acid Reflux - "back washing" of acid from the stomach into the esophagus; also called heartburn