The ________ are located between the atria and ventricles (in bird and mammalian hearts) and allow blood to flow from the atrium to the ventricle, but not in the reverse direction. atrioventricular valves venae cavea pacemakers atrioventricular nodes
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Option 1: Atrioventricular valves - These are the valves located between the atria and ventricles that prevent the backflow of blood. This seems like the correct answer. Option 2: Venae cavea - This is not a term related to the heart. It might be a misspelling Show more…
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The contraction of the heart begins with autorhythmic depolarization of the pacemaker node located in the superior portion of the posterior atrial wall. From the right atrium, the signal travels into the atrioventricular (AV) node located in the inferior interatrial septum. The AV node fires, causing the signal to pass through the AV bundle branches. Depolarization then arrives at the subendocardial conducting network, where the wave of depolarization disperses through the myocardium of the atria. Making a U-turn at the apex of the heart, the signals are then carried through the exterior walls of the ventricles by the ventricles. Finally, the signals reach the semilunar valves and the wave of depolarization continues into the ventricles.
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The _________ is an external feature that runs down the middle of the heart. aorta brachiocephalic artery posterior interventricular sulcus right atrium The ________ is present in arteries but not in veins. elastic lamina tunica intima tunica externa tunica media Blood in the heart flows inferiorly from the right atrium to the ________. left atrium left ventricle right ventricle aorta The __________ attach the valves to the walls of the heart. chordae tendineae vena cava brachiocephalic artery atrium The ______ appeared as dark purple circles in the prepared slides of cardiac muscle. intercalated disks striations arteries nuclei
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