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Animal Science 214

by: Dee Jaye Aldrich (Notetaker)

Animal Science 214 AN S 214

Dee Jaye Aldrich (Notetaker)
GPA 2.89
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About this Document

Week 1 of class. This material will be on Exam 1 and is just a general overview of the GI System.
Domestic Animal Physiology
Class Notes




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This 2 page Class Notes was uploaded by Dee Jaye Aldrich (Notetaker) on Wednesday July 27, 2016. The Class Notes belongs to AN S 214 at Iowa State University taught by Staff in Fall 2016. Since its upload, it has received 49 views. For similar materials see Domestic Animal Physiology in Animal Science at Iowa State University.

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Date Created: 07/27/16
AnS 214 Lecture Week 1 GI TRACT Structural Hierarchy: - Chemical, Cellular, Tissue, Organ, Organ System Cell- basic unit of structure and function 4 Tissue types: 1.) Epithelial - form membranes; glands 2.) Connective- blood cells; matrix 3.) Muscle - Smooth ( involuntary) Ex: stomach, esophagus - Skeletal (voluntary) Ex: movement - Cardiac ( Involuntary) Ex: heart, diaphragm 4.) Nervous - electrical impulses Homeostasis- maintain stability; consistency - Includes nervous and endocrine systems 3 parts: 1.) Sensor: Ex- Skin 2.) Control center: Ex- Hypothalamus 3.) Effector: Ex- blood vessels Afferent- Towards Efferent- Away from Negative Feedback Loop Sensors- integration Effector – REDUCTION Example: after a meal, blood sugar rises, liver releases bile to REDUCE blood sugar Positive Feedback Loop Sensors- integration Effector- AMPLIFICATION Example: oxytocin released to cause CONTRACTIONS to push baby out Propulsion- movement of food through the GI tract The Esophagus is the least involved in the mechanical breakdown of food. The Stomach: Secretes, Mechanically breaks down food, Digests and absorbs. Function of Saliva include: - Moistening of food and compacting the bolus - Cleanse the mouth - Break down of carbohydrates


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