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.
A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate. Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm.