The terms precertification, prior authorization, and prior approval<span> are used</span>
In the case of an injury, blood transportation is important to deliver to form a barrier to keep blood loss. Blood platelets clot to prevent blood loss, white blood cells as well are used to close the wind and prevent any external bacteria from invading the inside of one’s body.
A. Pacemaker cells located in the atria fire before the pacemaker cells in the ventricles. B. It takes time for hormones to diffuse from the atria to the ventricles to trigger contraction. C.The electrical signal generated in the right atrium is delayed at the AV node before passing to the ventricles. D.The ventricular muscle cells contract more slowly than the atrial muscle cells.
