Dulce Cuellar BIOS256 Week 3 Lab Exercise Review of Mechanical Digestion in the Gastrointestinal Tract

Introduction 1. Define the gastrointestinal tract (GI). An organ system that is responsible for the digestion of food, absorbing nutrients, and expelling waste. 2. Identify three mechanical digestion activities. a. Mastication 3. b. Peristalsis c. Segmentation Name two feedback loops that regulate digestive system smooth muscle responsible for propulsive and mixing movements. Hormonal feedback loops and Neural feedback loops Neural Regulation of Mechanical Digestion 4. Identify three neural systems that control the mechanical movements in the GI tract. a. Central nervous system b. ANS (long) Reflexes c. ENS (local) Reflexes 5. Describe the role of the CNS with regard to swallowing. What is the stimulus? The CNS controls voluntary swallowing movements. The presence of food is the stimulus for voluntary movements. 6. a. What are the components of the ANS (long) neural reflexes?