Drop/Add and Withdrawal Deadlines. Registration deadlines determine the last day you are able to add, drop or withdraw from classes. Each class has its own set of registration deadlines which are based on the length of the class as well as the session in which the class is held.
cardiac pacemaker - a specialized bit of heart tissue that controls the heartbeat. SA node, sinoatrial node, pacemaker. cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction.
In simpler words, it makes the heart to start again when there is a cardiac arrest (not the asistolia kind). A pacemaker is a device that makes the heart to beat the necessary times per minute to achieve the patient's needs according to their activity , but can't make the heart to beat again if there is an arrest.