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 under the skin of your chest or abdomen to help control abnormal heart rhythms. Pacemakers have sensors that detect the heart's electrical activity. When the device senses an abnormal heart rhythm, it sends electrical pulses to prompt the heart to beat at a normal rate.