Heart_2019(1).ppt - Cardiovascular System The Heart At the...

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Cardiovascular System: The Heart
At the end of this unit you should be able to: Relate the structures of the cardiovascular system to the primary functions. Identify external and internal structures of the heart including the layers, chambers and valves. Trace the flow of blood through the pulmonary and systemic pathways of the heart and great vessels. Identify the parts of the heart supplied by the major coronary arteries and drained by the major coronary veins. Identify the vessels and their course. Characteristics of cardiac muscle tissue Compare and contrast the various components of the heart's conduction system. Including external control and feedback to the heart Describe the electrical and mechanical events of the cardiac muscle cells compared to skeletal muscle cells. Given an EKG tracing, identify the electrical events including the intervals and segments. Outline the events of the cardiac cycle. Apply the functioning of the conduction system to the mechanical events of the cardiac cycle. Relate factors that influence cardiac output, stroke volume, heart rate, and reserve.
Components of the Cardiovascular System The Blood Vessels Arteries Veins Capillaries The Blood The Heart *APR: Cardiovascular System Overview
Function of the Cardiovascular System Delivers oxygen and nutrients and removes waste and carbon dioxide throughout the body. Provides adequate perfusion of tissues.
The Heart: Location The heart is located in the mediastinum About 2/3 of the heart lies to the left of the body’s midline
The Heart: Size & Shape The heart is approximately the size of a closed fist and is shaped like a cone laying on its side. Ba se Apex
Layers of the Heart The heart is composed of several layers. From superficial to deep they are: The pericardium The epicardium The myocardium The endocardium
Fibrous pericardium – helps retain the hearts position in the mediastinum and prevents overfilling of heart Dense irregular connective tissue Serous pericardium reduces friction for heart movement Parietal layer Visceral layer (same as epicardium) Pericardial fluid in potential space The Pericardium
The Epicardium Epithelial and connective tissue layer covering the heart Same as visceral layer of pericardium This is the outermost layer of the heart wall .
The Myocardium Cardiac Muscle This is the middle layer of the heart wall which is composed of cardiac muscle. Thickest of the three layers. Thickness varies according to function of each chamber
The Endocardium This is the innermost layer of the heart wall and is continuous with the inner lining of the blood vessels. Epithelial tissue with basement membrane
Anatomy of the Heart: The Chambers Left Atrium Left Ventricle Right Atrium Right Ventricle The heart is comprised of 4 chambers .
Chambers of the Heart Chamber separation Interatrial septum thin wall separating right and left atria Interventricular septum thick wall separating right and left ventricles Interatrial Septum Interventricular Septum
Chamber Separation
The Heart is a 2 pump structure

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