CV1-09 - Pattern of Mammalian Circulation: closed...

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Pattern of Mammalian Circulation: closed circulatory system with two circuits in parallel High Oxygen Low Oxygen Pulmonary Circuit Systemic Circuit Fig 12-2
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Cardiac Output = volume flow rate from each ventricle (lungs receive same total) Distribution of Cardiac Output: kidney receives same percentage of cardiac output as total skeletal muscle mass! Fig 12-3
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Components of a Closed Circulatory System (Systemic Circuit): Characteristics of vessel types Heart (pump) Left Ventricle Aorta and Large Arteries high elasticity (“recoil”): pressure reservoir Arterioles: thick smooth muscle layer, high sympathetic NS innervation, regulation of blood flow/ pressure Capillaries: single cell layer, “exchange vessels” Veins:high compliance, volume reservoir Interstitial Fluid Cells Lymphatic vessels 120/0 mm Hg 120/80 mm Hg
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Valves prevent backflow of blood: anchored by chordae tendinae Circulation through the heart and heart valves: follow the direction and pattern of blood flow Fig 12-6 bicuspid/ mitral valve tricuspid
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Right AV valve Pulmonary valve aorta Heart Valves function passively to prevent backflow Pulmonary arteries Left AV valve (bicuspid) Aortic valve 120/80 120/0 10/2 Left atrium Left ventricle “Lub” “Dub”
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Drawings and Images of Heart Valves Fig 12-7
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Summary of Circulatory Plan Systemic circuit “crosses over” from left to right side of heart Pulmonary circuit “crosses over” from right to left side Fig 12-8
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Cardiac Cycle of ventricular contraction/ ventricular
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CV1-09 - Pattern of Mammalian Circulation: closed...

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