Pulmonary Circuit Systemic Circuit - from heart to lungs back to heart - from heart to body back to...
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Pulmonary
Circuit
Systemic
Circuit
- from heart to lungs back to heart
- from heart to body back to heart
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• Heart Tissue
• Pericardial Sac
• Fibroskeleton
• Surface Structures
• Valves(one-way-flow)
The Heart
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Position and Orientation of the Heart
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Pericardial Sac and Location of the Heart in the Thoracic Cavity
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• Epicardium– Visceral pericardium
• Endocardium– Epithelium of inner surface
• Myocardium– Muscular wall of the heart
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The Fibrous Skeleton
Is an internal connective tissue of the heart
1. Provides attachment for heart’s valves
2. Evenly distributes the force of contraction
3. Electrically isolates atria from ventricles
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Surface Anatomy of the Heart
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Sectional Anatomy of the Heart
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The Atria• Right Atrium receives blood from systemic circuit:
1) Superior vena cava
2) Inferior vena cava
3) Coronary Sinus
• Walls of both Atria have Pectinate muscles.
• Foramen ovale open in utero –
closes to become the Fossa ovalis after birth.
• Left Atrium receives blood from pulmonary circuit:
From L and R Pulmonary veins.
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The Ventricles
• Blood comes from atria through atroventricular (AV) valves:– Tricuspid AV valve (Rt) and Bicuspid AV valve (Lt)
• Blood leaves via pulmonary truck (Rt) and aorta (Lt)– Pulmonary semilunar valve– Aortic semilunar valve
• Chordae Tendineae • Papillary Muscles• Trabeculae Carneae
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Valves of the Heart
How do papillary muscles work?
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Heart Valves and Heart Sounds
• Closure of the AV valves create the 1st heart sound (‘lub’).
• Closure of the semilunar valves create the 2nd heart sound (‘dupp’).
• Stethoscope Placement
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Coronary Circulation
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Circulation
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Fetal Circulation