Cardiovascular System Chapter 13 - calhoun.k12.al.us
CardiovascularObjectives: System 1.Identify Chapter 13 structures and functions of the cardiovascular system. 2.Trace the flow of blood through the body. Coverings of the Heart Pericardium: (?)
1. Visceral (?)pericardium (epicardium(?)) Innermost layer Covers the heart 2. Parietal (?)pericardium Outer layer of visceral pericardium Forms inner lining of fibrous pericardium 3. Fibrous (?)pericardium Dense connective tissue attached to central portion
of diaphragm, posterior of sternum, vertebral column, and large blood vessels attached to heart Pericardial Cavity Space between parietal and visceral pericardium layers Filled with serous fluid to reduce friction between the membranes as the heart moves Wall of the Heart 1. Epicardium
Outer layer Corresponds to visceral pericardium Protects heart by reducing friction 2. Myocardium Thick, middle layer
Consists mostly of cardiac muscle tissue that pumps blood out of the heart chambers 3. Endocardium Inner layer Epithelium and connective tissue Heart Chambers & Valves ????
Four hollow chambers: Upper chambers = atria (atrium) Lower chambers = ventricles Atria Thin walls Receive blood returning to the heart Ventricles
Receive blood from the atria Contract to force blood out of the heart into the arteries Heart Chambers & Valves, continued.. Left atrium and ventricle are separated from the right atrium and ventricle by a solid, wall-like septum. Atrioventricular valve separates ??? Tricuspid valve on the right
3 cusps Bicuspid valve (mitral valve) on the left 2 cusps Allows blood to flow ONLY from atrium to ventricular no backflow Heart Chambers & Valves, continued..
Right atrium receives blood from: Superior vena cava (???) Inferior vena cava (???) Coronary sinus small vein that drains blood from the myocardium Right ventricle Thinner muscular wall than the left ventricle Only has to pump blood to the lungs
Blood leaves the ventricle through the pulmonary valve, and enters the pulmonary trunk, which divides into the left and right pulmonary arteries. Heart Chambers & Valves, continued.. Left atrium receives blood from the lungs through 4 pulmonary veins. Blood leaves the left ventricle through the aortic valve, into the aorta. Ventricular wall is thicker has to pump
blood to the rest of the body Sketch & Label the Valves Label the Exterior Heart
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