Cardiovascular System 2

Cardiovascular System 2 - Cardiovascular System Circulation...

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Cardiovascular System
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Circulation – Blood Vessels - a system of closed ducts Principal types of vessels 1. Arteries 2. Veins 3. Capillaries
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Arteries: blood flow away from the heart toward the tissues. Three Main Types 1. Elastic arteries 2. Muscular arteries 3. Arterioles
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Veins: return to heart under low pressure. valved to carry blood against gravity Capillaries: Anastomoses: Collateral channels joining distal ends of blood vessels- Small bypasses - alternate directions
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Function: To move blood (a connective tissue) Heart is a Pump!! Forces blood through blood vessels Blood vessels are a closed system of ducts Connects cells to external environment Brings them metabolic building materials Takes away metabolic wastes Acts as a defensive system
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HEART: Located in thorax Rests on diaphragm ENCLOSURE: Laterally by the lungs Posteriorly by backbone Anteriorly by the sternum Base is between the second ribs Distal end hangs down to the left
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Heart: Coverings: Surrounded by double-layered pericardium Inner layer: Visceral pericardium. Closely applied to surface of heart Outer layer: Parietal pericardium. Loose layer Pericardial cavity lies between- filled with fluid
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Wall of the Heart: 3 layers 1. Epicardium (visceral pericardium): 2. Myocardium 3. Endocardium
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Epicardium (visceral pericardium): Protective outer layer Connective tissue covered with epithelium Blood capillaries Lymph capillaries Nerve fibers
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Myocardium: Muscular contractions Cardiac muscle Nerve fibers
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Endocardium: Epithelial membrane (simple squamous) “Endothelium” Blood vessels Some muscle fibers
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Chambers: Atria : Upper: Blood from veins enters Ventricles : Lower: Forces blood out into arteries
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Valves: (prevent backflow) Tricuspid Valve Pulmonary Semilunar Valve Bicuspid (Mitral) Valve Aortic Semilunar Valve
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Tricuspid Valve Right atrioventricular orifice Prevents backflow from RV back to RA during ventricular contraction
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This note was uploaded on 12/08/2011 for the course AMY 2B taught by Professor Dianeolin during the Summer '09 term at Riverside Community College.

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Cardiovascular System 2 - Cardiovascular System Circulation...

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