The “lub” sound (or first heart sound) of the heart is caused by The closing of the atrioventricular (AV)
The “lub” sound (or first heart sound) of the heart is caused byThe closing of the atrioventricular (AV) valves The closing of the semilunar (SL) valves The blood rushing out of the ventricles The ventricles filling with blood Looking for a Similar Assignment? Order now and Get 10% Discount! Use Coupon Code “Newclient”