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Where I Could Be…
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Circulatory System
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Circulatory System
• Transportation system• Transports oxygen and nutrients to
body cells• Carries carbon dioxide and
metabolic materials away• Consists of heart, blood vessels,
and blood
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The Heart
• It’s “ The Pump ”• A Hollow Organ• Located Between Lungs
– behind sternum– above diaphragm
• Septum– muscular wall separating heart into
right and left sides
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Three Layers of Tissue
• Endocardium– smooth, inside lining– allows for the smooth flow of blood
• Myocardium– middle, muscular layer – thickest layer
• Pericardium– double layered membrane sac– covers outside of heart
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Four Chambers of the Heart
• Right Atrium (BLUE)• Right Ventricle (BLUE)/destination
lungs• Left Atrium (RED)• Left Ventricle (RED)/destination
body cells
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Valves(doors with one-way
openings)• Tricuspid valve• Pulmonary valve• Mitral Valve (Bicuspid)• Aortic Valve
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Heartbeat Cycle(Process of filling &
emptying)• Diastole (heart relaxation)• Systole (heart contraction)• Atria contract• Atria relax• Systole begins• Ventricles contract
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“The Plumbing”
• Aorta supplies arteries that oxygenate the walls of the heart with O2
• Coronary Arteries• Heart Attack occurs when these
vessels are blocked.
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Conductive Pathway• Sinoatrial node (SA)/pacemaker• Atrioventricular node (AV)/relay
station• Bundle of His/(R) & (L) Bundle
Branches• Purkinje Fibers/generates
contraction of ventricles
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Blood Vessels
• Arteries (away from heart)– Aorta– Arterioles
• Capillaries• Veins (toward heart)
– Venules– Superior Vena Cava– Inferior Vena cava
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Blood Composition
• 4-6 Quarts of Blood (average adult)• Plasma (90% water)• Cells
– Erythrocytes– Leukocytes– Thrombocytes
• Donate Blood!!!
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Diseases
• Anemia– Iron deficiency– Aplastic – Pernicious– Sickle Cell
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Diseases
• Aneurysm• Arteriosclerosis• Atherosclerosis• Congestive Heart Failure• Embolus• Hemophilia• Leukemia
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Diseases
• Myocardial infarction• Phlebitis• Varicose veins
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THE END !!!