Digestive_Physiology_Objectives

Digestive_Physiology_Objectives - What You Should Have...

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What You Should Have Gotten Out of the Digestive Physiology Lecture or Learning Objective for Digestive Physiology Digestion breaks large food molecules into small molecules that can be absorbed. The digestive system consists of the organs of the digestive tract and accessory organs that secrete substances into the tract. 1. Describe the function of the digestive system. Describe why it is that the contents of the GI tract are not considered to be within the body proper (internal environment). Understand why it is a good thing the contents of the GI tract are not within the body (since the conditions can be extreme). Define digestion and describe why it’s necessary. Describe the organs within the digestive system as presented in class. The absorbable units of the main food categories are: for carbohydrates -- monosaccharides, for proteins -- amino acids, and for fats -- monoglycerides and fatty acids. 2. Understand how the 3 main categories of foods are digested (what’s hydrolysis and what does it do to the food molecules? Understand that the digestive enzymes are very specific). Know the units of each food category that can be absorbed. Because the GI tract has neuron plexuses in the tract, reflexes can occur without the central nervous system being involved. 3. Describe the 4 layers of the GI tract as presented in class. Describe the GI tract's local nervous system (enteric nervous system). Describe intratract or short reflexes and long (typical) reflexes. Understand how GI neural reflexes can occur without the CNS involved. Carbohydrate digestion begins in the mouth with salivary amylase. Swallowing is orchestrated by the swallowing center in the medulla; there is a precisely programmed sequence of events that occur during swallowing. 4. Describe carbohydrate digestion in the mouth (what enzyme?) Describe swallowing – oropharyngeal stage (in mouth and pharynx) and esophageal stage (in esophagus). Understand the events in the oropharyngeal phase of swallowing that occur to keep food out of the respiratory tract. Know why you can swallow while standing on your head. Describe secondary peristaltic waves. Describe heartburn. The stomach secretes a protein digesting enzyme (in an inactive form), HCl, mucus
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Digestive_Physiology_Objectives - What You Should Have...

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