Ch.11 Cardiovascular System - Chapter 11 The Cardiovascular...

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Chapter 11 The Cardiovascular System The Cardiovascular System A closed system of the heart and blood vessels The heart pumps blood Blood vessels allow blood to circulate to all parts of the body The functions of the cardiovascular system To deliver oxygen and nutrients to cells and tissues To remove carbon dioxide and other waste products from cells and tissues The Heart Location Thorax between the lungs in the inferior mediastinum Orientation Pointed apex directed toward left hip Base points toward right shoulder About the size of your fist The left lung is smaller because the heart is slightly more on the left side (Possible Question). The Heart: Coverings Pericardium—a double-walled sac Fibrous pericardium is loose and superficial Serous membrane is deep to the fibrous pericardium and composed of two layers Visceral pericardium Next to heart; also known as the epicardium Parietal pericardium Outside layer that lines the inner surface of the fibrous pericardium Serous fluid fills the space between the layers of pericardium The Heart: Heart Wall Three layers Epicardium- Outside layer This layer is the visceral pericardium Connective tissue layer Myocardium Middle layer Mostly cardiac muscle Endocardium-Very Smooth Inner layer Endothelium
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Picture on Slide 12-Need to know for test The Heart: Chambers Right and left side act as separate pumps Four chambers Atria-Receiving blood-Thin mucsle Receiving chambers Right atrium-Receives deoxygenated blood from the venocava (superior and inferior) Left atrium- Ventricles-Sending/pumping blood out. Thick muscle Discharging chambers Right ventricle-Pump out to pulmonary arteries. Left ventricle-Pump out to the aorta. The Heart: Septa Interventricular septum-Separating the ventricles. Separates the two ventricles Interatrial septum-Separating point between the two atrium. Separates the two atria Know slide 14 diagram (Test) Also slide 15 The Heart’s Role in Blood Circulation Systemic circulation-Whole body Blood flows from the left side of the heart through the body tissues and back to the right side of the heart Pulmonary circulation-Lungs Blood flows from the right side of the heart to the lungs and back to the left side of the heart The Heart: Valves Allow blood to flow in only one direction to prevent backflow Four valves Atrioventricular (AV) valves—between atria and ventricles Bicuspid (mitral) valve (left side of heart) Tricuspid valve (right side of heart) Semilunar valves—between ventricle and artery Pulmonary semilunar valve Aortic semilunar valve Pathway of Blood: Inferior and Superior Venecava Right atrium Atrioventricular valve (The tricuspid valve) Right ventricle Pulmonary semilunar valve Pulmonary trunk Branches off into the pulmonary arteries (right and left)
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Lungs Pulmonary veins
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