LE 42-5Anteriorvena cavaPulmonaryarteryCapillariesof right lungAortaPulmonaryveinRight atriumRight ventriclePosteriorvena cavaCapillaries ofabdominal organsand hind limbsPulmonaryveinLeft ventricleLeft atriumAortaPulmonaryarteryCapillaries ofhead andforelimbsCapillariesof left lungLE 42-6Right atriumPosteriorvena cavaPulmonaryveinsAnteriorvena cavaPulmonary arteryPulmonaryveinsRightventricleAortaSemilunarvalveAtrioventricularvalvePulmonaryarteryLeft atriumSemilunarvalveAtrioventricularvalveLeftventricleLE 42-7SemilunarvalvesclosedAV valvesopen0.1 sec0.3 sec0.4 secAtrial andventriculardiastoleAV valvesclosedVentricular systole;atrial diastoleSemilunarvalvesopenAtrial systole;ventriculardiastoleLE 42-8Pacemakergenerates wave ofsignals to contract.Signals are delayedat AV node.Signals passto heart apex.Signals spreadthroughoutventricles.SA node(pacemaker)ECGAV nodeBundlebranchesHeartapexPurkinjefibersLE 42-9EndotheliumEndotheliumSmoothmuscleConnectivetissueCapillary100 µmBasementmembraneEndotheliumSmoothmuscleConnectivetissueValveArteryArterioleVenuleVeinArteryVeinLE 42-5Anteriorvena cavaPulmonaryarteryCapillariesof right lungAortaPulmonaryveinRight atriumRight ventriclePosteriorvena cavaCapillaries ofabdominal organsand hind limbsPulmonaryveinLeft ventricleLeft atriumAortaPulmonaryarteryCapillaries ofhead andforelimbsCapillariesof left
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