chapt19 v0806Heart(1)

chapt19 v0806Heart(1) - The Cardiovascular System The Heart...

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1 The Cardiovascular System: The Heart
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2 The Heart Cardiovascular system heart, arteries, veins and capillaries 2 major divisions : 1. Pulmonary circuit - right side of heart carries deoxygenated blood to lungs 2. Systemic circuit - left side of heart supplies oxygenated blood to the body Cardiology- study of the heart
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3 Cardiovascular System Circuit
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4 Size, Shape and Position Big a a closed fist, males have bigger anatomical hearts Located in the mediastinum, like a cone on its side between the lungs Base - broad superior portion of heart Apex - inferior end, tilts to the left, tapers to point
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5 Pericardium Pericardium- surrounds heart, keeps your heart in it’s place (like a father-in-law with the gun collection) Allows heart to beat without friction, room to expand and resists excessive expansion Two layers: Fibrous- superficial protects, prevents overstretching, anchors heart Serous- deep Pericarditis= inflammation of pericardium Cardiac Tamponade= fluid in the pericardium compressing the heart, can stop the heart beat
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6 Heart Wall 3 layers of the Heart wall 1.) Epicardium- outside slippery layer Also called the visceral pericardium (just to be confusing) 2.) Myocardium- muscle of heart 3.) En docardium- in side the heart, covers chambers and heart valves
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7 Parietal pericardium Pericardium & Heart Wall
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8 Heart Chambers 4 chambers Right and left atria (= entry halls) 2 superior, posterior chambers receive blood returning to heart Right and left ventricles (= little bellies) 2 inferior chambers pump blood into arteries Left ventricle is thicker, why?
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9 Anterior Anatomy – Atrioventricular sulcus - separates atria, ventricles Anterior and posterior interventicular sulci - grooves separate ventricles Atrioventricular sulcus
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10 Posterior Heart Anatomy Posterior Interventricular Sulcus- groove separating ventricles
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11 Heart Chambers - Internal Interatrial septum wall that separates atria Pectinate muscles internal ridges of myocardium in right atrium and both auricles Interventricular septum wall that separates ventricles Trabeculae carneae internal ridges in both ventricles walls Chordae tendineae- cords connecting to the tricuspid and mitral valves
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12 Internal Anatomy Anterior Aspect
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13 Heart Valves Ensure one-way blood flow Semilunar valves - control flow into great arteries pulmonary: from right ventricle into pulmonary trunk aortic: from left ventricle into aorta Atrioventricular (AV) valves r ight A V valve has 3 cusps ( t ricuspid valve) rat l eft A V valve has 2 cusps ( m itral, b icuspid valve) lamb chordae tendineae - cords connect AV valves to papillary muscles (on floor of ventricles)
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14
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15 Heart Valves
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16 Valve Anatomy The AV valves, the tricuspid and bicuspid (mitral) valves
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17 AV Valve Mechanics Ventricles relax , pressure drops , semilunar valves close , AV valves open , blood flows from atria to ventricles
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