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Quiz5studyGuide - Atria Mainly collect blood Blind...

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Atria: Mainly collect blood Blind pockets-auricles Right side: superior (cranial) and inferior (caudal) vena cava, coronary sinus Left side: pulmonary veins Minimal contractile action Up to 20% blood volume Fossa ovalis      remnant of the foramen ovale  that connects the atria until birth Right to left shunting to bypass the lungs Sinoatrial (SA) and atrioventricular (AV) nodes Ventricles: Mainly discharge blood Contractile action pumps blood Into pulmonary arteries or aorta Thickness differences (below)  Trabeculae carnae -rugose ridges on the heart’s chamber walls (leverage/clearance);  see lower right fig.  Papillary muscles attach to the chordae tendinae that attach to AV valve leaflets-keep the AV  valves from collapsing upward (blowing out) under pressure Conduction Pathway: SA node    Atrial myocardium    AV node  (reduced number of gap jts)    Bundle of His (Common bundle)    Bundle branches    Left bundle branch
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Quiz5studyGuide - Atria Mainly collect blood Blind...

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