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We have two Circulatory Systems 1. Cardiovascular System 2. Lymphatic System Our Heart is like 2 Hearts in One Right Heart Left Heart •Right Atrium •Left Atrium •Right Ventricle •Left Ventricle •Receives Deoxygenated blood from Body •Pumps Oxygenated blood to Body The Cardiovascular System Closed System (self sealing = clotting) Blood is enclosed in blood vessels carries O2 and nutrient to cells, CO2 and wastes from cells, hormones, antibodies Structures •Heart •Arteries •Capillaries •Veins Pulmonary Circulation Right Ventricle through lungs & back to Left Atrium Systemic Circulation Left Ventricle to all 10 Systems & back to Right Atrium. Coronary Circulation to heart GI & Hepatic Portal to abdominal & digestive organs Renal Circulation to kidneys Heart Conduction Pacemaker of the heart Artificial Pacemaker Involuntary, striated, branched Comparison of Artery & Vein Thick smooth muscle wall Under high pressure & deep…why? Carry blood away from heart O2 (except pulmonary arteries…why?) Thin smooth muscle wall Less pressure & more supericial…why? Carry blood to heart DeO2 (except pulmonary veins…why?) Veins carry blood to the heart Capillaries Connect Artery to Vein Walls of Arteries & Veins are thick Blood is moving fast So, where does blood do all its Work? At the capillaries Why? Blood Pressure forces some of the Plasma minus large blood proteins to leak out of Capillary (Filtration) into the Tissues Exchange of ALL Nutrients, Gases, & Wastes occurs here Too much fluid = Edema Lymphatic System •Some Plasma (minus blood proteins filters (“leaks”) out of capillaries into Tissues •Now called Tissue (Extracellular) Fluid, much will drawn back into capillaries by Serum Albumin •More Tissue Fluid will be drawn into Lymphatic vessels, now called Lymph •Lymph will pass through Lymph Nodes where it will be purified by WBCs •Lymph is emptied into Subclavian Veins where it is now part of the Plasma