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lab_8_discussion

lab_8_discussion - Exercise 8 Intestinal Motility 1 Draw a...

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Exercise # 8 ________________________ Intestinal Motility 1) Draw a diagram of the small intestine layers and describe the function of the layers and components of each layer. Mucosa has smooth muscle and capillaries and immune cells. Submucosa has loose connective tissue and larger blood vessels and glands. Muscle layer: muscularis externa has 2 layers of SM. Inner layer of circular SM which changes diameter and an outer layer of longitudinal SM which changes intestinal length. Serosa: layer of connective tissue covered by epithelial cells that surround the tract Where does absorption occur? Mucosa. What is the enteric nervous system? Enteric nervous system controls GI and consists of afferent neurons that detect change in luminal activity. Interneurons and afferent neurons which activate/inhibit affector cells which are SM cells. How do the autonomic nervous system and the enteric nervous system regulate gut activity? Enteric Activates or inhibits SM cells so it can cause contraction or relaxation. PNS uses the vagus nerve to synapse with ENS and release Ach to cuase an increase in baseline tension but does not affect frequency of contraction. SNS works through the splanchnic nerve and can synapse to the ENS or directly to effector cells. Release
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