3.+Heart_presentation - The circulatory system Harvey Blood...

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Harvey: Blood was pumped out of the heart and into the tissues through ONE TYPE OF VESSEL and back to the heart through ANOTHER TYPE OF VESSEL. Humans have a CLOSED CIRCULATORY SYSTEM composed of heart, blood vessels and blood BLOOD is the body’s internal transportation system The heart and blood vessels make up the cardiovascular system The circulatory system
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Location of Heart Inside thoracic cavity in mediastinum In the center of chest deep to sternum, apex tipped inferiorly toward the left; base superior In the pericardium
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Pericardium - Covering 1. Fibrous pericardium - tough, collagenous pericardial sac 2. Serous parietal pericardium (lines fibrous pericardium) 3. Pericardial space with 10-20 ml of pericardial fluid 4. Serous visceral pericardium adheres to the heart surface (epicardium)
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Structure of Heart Wall Epicardium = visceral pericardium (serosa) Myocardium : muscle tissue,blood vessels,fibrous skeleton - internal collagen and elastic fibers network that encircles bases of great vessels & valves What are its functions? Endocardium : simple squamous epithelium continuous with endothelia of blood vessels
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Atrioventricular sulcus -coronary Surface Anatomy of Heart Anterior view
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Surface Anatomy of Heart Posterior view
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Right and left atria (2) superior, posterior chambers receive blood returning to heart Right and left ventricles (2) inferior chambers pump blood into arteries separated on the surface by? Atrioventricular sulcus separates? Heart Chambers - 4
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Atria - Internal Auricle – what for? Interatrial septum -wall that separates atria Pectinate muscles Atria - Internal Receiving chambers, small, thin-walled
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Discharging chambers, form most of the heart’s volume Interventricular septum - wall that separates ventricles Trabeculae carneae Papillary muscles Ventricles - Internal
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Left vs. Right Ventricle Left: high pressure pump Right: low pressure pump right chamber is thinner walled than left
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Pulmonary circuit - right side carries blood to lungs for gas exchange The pulmonary trunk Right and left pulmonary arteries Pulmonary veins. Why are they special? Systemic circuit – left side carries blood to all organs Aorta Ascending Aortic arch The superior/inferior venae cava The great vessels
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Pulmonary & Systemic Circuits artery vein capillaries
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Structure and Function of Valves mitral valve What is their function? Close passively under blood pressure Heart sounds produced by valve closure
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Mitral Valve Prolapse Most common cardiac variation (5-10% of population) Mitral valve cusps do not close properly Regurgitation during left ventricular systole Not life threatening; may but lifestyle threatening How can you diagnose ?
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Valve Mechanics
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Valve Mechanics
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Blood Flow Through Heart
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Coronary Circulation Functional blood supply of the heart Coronary arteries: first branches off the ascending aorta .
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This note was uploaded on 06/28/2008 for the course HLTH 2532 taught by Professor Sturges during the Spring '08 term at Georgia Southern University .

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3.+Heart_presentation - The circulatory system Harvey Blood...

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