NEW UNIT --- DIGESTIVE SYSTEM 0070 Have your desk clear except for a piece of paper and pen or pencil. If your group is not finished with the activity from last class, see the teacher. She has your paper.

TODAY’S AGENDA DIGESTIVE SYSTEM  Bill Nye “Digestion”  From the video define the following terms:  Peristalsis, chyme, digestion and absorption.  Text book Health Science Fundamentals pg. 347  Read the chapter on digestion.  Worksheet

 Peristalsis: Smooth muscle movement in the digestive system.  Chyme: mixture of food and gastric juices in the stomach. (looks like a milk shake)  Digestion: breaking down food into usable pieces.  Absorption: the process of nutrients moving from the digestive system to the blood stream.

 Mouth Teeth Salivary glands  Mechanical vs chemical  Pharynx  Esophagus Food tube  Posterior to trachea

 Smooth muscle  Mechanical-chemical digestion  3 hours  Held by special sphincter muscles  Heart burn?

 20 ft long  3 sections Duodenum Jejunum Ileum  Most digestion and absorption occurs  Accessory organs  Liver, pancreas, gall bladder

 5 ft long  Water and salt reabsorbed - Average time 24 hours - Diarrhea - constipation