324Lecture12 heart and vasculature

324Lecture12 heart and vasculature - Circulation Bulk...

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Circulation Bulk Internal Transport
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Circulation Blood Vascular System: Blood; heart, vessels. I. Heart - a) chambers - 2 atria and 2 ventricles organization provides for dual circulation: 1.) pulmonary 2.) systemic b) cardiac (fibrous) skeleton - DICT, provides support and prevents over-stretching
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Heart Chambers Chamber Walls: a) endocardium - endothelium over delicate loose CT and smooth muscle b) myocardium - cardiac muscle, thin in atria, thick in ventricles; cells organized in spiral fashion; connect internally to cardiac skeleton. c) epicardium - external coat; mesothelium over delicate loose CT = visceral pericardium (serous membrane).
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Heart Chambers Ventricular Cavities - internal surface with longitudinal ridges = trabeculae carnae. Muscle extensions at ends of trabeculae = papillary muscles. CT strands from ends of papillary muscles to undersides of AV valves = Chordae Tendinae.
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Heart Conduction System Responsible for basic beat rhythm. SA Node -> AV Node -> Atrioventricular Bundles -> Bundle of His -> Purkinje Fibers.
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Cardiac CT Forms 4 distinct plates: a) interatrial septum - plate between atria; open in embryo (Foramen Ovale), allows blood to by-pass lungs in fetal circulation; closes at birth leaving a depression in septum = Fossa Ovalis. Foramen works in conjunction with Ductus Arteriosus to
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This note was uploaded on 01/04/2012 for the course BIO 324 taught by Professor Crawford during the Spring '09 term at Western Kentucky University.

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324Lecture12 heart and vasculature - Circulation Bulk...

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