atrioventricular septum造句

• They extend throughout the myocardium from the apex of the heart toward the atrioventricular septum and the base of the heart.
• It forms the atrioventricular septum which separates the atria from the ventricles, and the fibrous rings which serve as bases for the four heart valves.
• The atrial canal is in turn divided into a right and left side by the atrioventricular septum, which originates from the union of the dorsal and ventral endocardial cushion.
• Regardless of the pathway, as the impulse reaches the atrioventricular septum, the connective tissue of the cardiac skeleton prevents the impulse from spreading into the myocardial cells in the ventricles except at the atrioventricular node.
• Although the name " atrioventricular septum " implies any septum between an atrium and a ventricle, in practice the divisions from RA to RV and from LA to LV are mediated by valves, not by septa.
• Contraction of the atria follows depolarization, represented by the P wave of the ECG . As the atrial muscles contract from the superior portion of the atria toward the atrioventricular septum, pressure rises within the atria and blood is pumped into the ventricles through the open atrioventricular ( tricuspid, and mitral or bicuspid ) valves.