heart anatomy & basic function (1) cardiovascular function
TRANSCRIPT
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Heart Anatomy &
Basic Function
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(1) Cardiovascular Function• Cardiovascular = Heart, Arteries, Veins, Blood
• Function:Function:– Transportation– Blood = transport vehicle– Carries oxygen, nutrients, wastes, and
hormones– Movement provided by pumping of heart
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(2) Cardiac Tissues• Outermost = Pericardium & Epicardium
– Pericardium is a membrane anchoring heart to diaphragm and sternum
– Pericardium secretes lubricant (serous fluid)– Epicardium is outermost muscle tissue
• Middle = Myocardium– Contains contractile muscle fibers
• Innermost = Endocardium– Lines Cardiac Chambers
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(3) Cardiac Chambers• Human heart has 4 chambers
– 2 Atria• Superior = primary receiving chambers, do not actually
pump• Blood flows into atria
– 2 Ventricles• Pump blood • Contraction = blood sent out of heart + circulated
• Chambers are separated by septum…– Due to separate chambers, heart functions as
double pump
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Deoxygenated Blood
…To the lungs
Oxygenated Blood
…To the rest of the body
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(4) Pulmonary Circulation• Pulmonary = Deoxygenated Blood• Involves Right Side of Heart
• Pathway:Pathway:1. Superior / Inferior Vena Cava2. Right Atrium Tricuspid Valve3. Right Ventricle Pulmonary Semilunar Valve4. Left Pulmonary Artery5. Lungs
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(5) Systemic Circulation• Systemic = Oxygenated Blood• Involves Left Side of Heart
• Pathway:Pathway:1. Left Pulmonary Vein2. Left Atrium Bicuspid Valve3. Left Ventricle Aortic Semilunar Valve4. Aorta5. All Other Tissues
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(6) Cardiac Valves[4 main valves]
• When the heart is relaxed…– Blood passively fills atrium– Flows right past tricuspid / bicuspid valves– Semilunar Valves remain shut
• When the heart contracts (pumps)…– Tricuspid / Bicuspid valves swing up and shut– Blood ejected out of ventricle– Semilunar Valves open up
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