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Cardiovascular

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Circulation

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  • Circulation
    • Path of blood flow: Atriumventriclearteryarteriolecapillariesvenulesveins → other atrium
    • Pulmonary (lung) circuit
      • Starts in right atrium and ventricle
      • Pulmonary arteries carry blood to lung to be oxygenated
        • Deoxygenated (low O2)
        • High CO2
      • Pulmonary veins return oxygenated blood to heart (left atrium)
      • Low pressure system
        • Right ventricle has thinner walls than left ventricle, since it needs to generate less pressure
    • Systemic (body) circuit
      • Starts in left atrium and ventricle
      • Arteries carry blood to body tissues to supply nutrients and oxygen
        • Oxygenated (high O2)
        • High CO2
      • Veins carry deoxygenated blood back to heart
        • Empty into (superior and inferior) vena cavae, which empties into right atrium
      • High pressure system
        • Left ventricle has thicker/stronger muscular wall, as systemic circulation has higher pressure