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CARDIOVASCULAR SYSTEM - CARDIO-VASCULAR SYSTEM Principles...

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y M. Frolich, CARDIO-VASCULAR SYSTEM Principles Structures Two circuits Pulmonary Systemic Fetal Circulation Heart Details Other details
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y M. Frolich, What Does C-V System do? Circulate blood throughout entire body for Transport of oxygen to cells Transport of CO2 away from cells Transport of nutrients (glucose) to cells Movement of immune system components (cells, antibodies) Transport of endocrine gland secretions
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y M. Frolich, How does it do it? Heart is pump Arteries and veins are main tubes (plumbing) A rteries A way from Heart Veins to Heart Diffusion happens in capillaries (oxygen, CO2, glucose diffuse in or out of blood)
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y M. Frolich, Heart/Great Vessels-- 1 Route Smaller aa. vv.--many routes (collateral circulation) Capillaries—network where diffusion occurs Overall Organization of System
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y M. Frolich, Collateral Circulation
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y M. Frolich, Walls of Arteries and Veins Tunica externa Outermost layer CT w/elastin and collagen Strengthens, Anchors Tunica media Middle layer Circular Smooth Muscle Vaso-constriction/dilation Tunica intima Innermost layer Endothelium Minimize friction Lumen pg 546
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y M. Frolich, Artery/Vein differences Arteries (aa.) Veins (vv.) Direction of flow Blood Away from Heart Blood to Heart Pressure Higher Lower Walls THICKER: Tunica media thicker than tunica externa THINNER: Tunica externa thicker than tunica media Lumen Smaller Larger Valves No valves Valves (see next)
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y M. Frolich,
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y M. Frolich, Capillaries Microscopic--one cell layer thick Network Bathed in extracellular matrix of areolar tissue Entire goal of C-V system is to get blood into capillaries where diffusion takes place
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y M. Frolich, Two circulatory paths Pulmonary Systemic
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y M. Frolich, GREAT VESSELS Aorta IVC, SVC Pulmonary Trunk Pulmonary Veins
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y M. Frolich, Heart Chambers and Valves
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y M. Frolich,
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