1. Remember that the heart behaves like an electric dipole. With + and - signs, indicate the location of the heart's positive and negative potentials during each part of the EKG graph (See Figure 1 in the instructions docu- ment). Then draw an arrow indicating the direction of the heart's depolar- ization for each part of the EKG graph. (Although the field lines travel from the positive electrode to the negative electrode, the depolarization wave travels from negative potential to positive potential.) The first one is done for you as an example. (6 Points)