W a. Your equipment can capture an EKG signal that permits analysis of one cycle of heart activity on different time-scales: (1) a sharp peak (i.e., the QRS complex), and (2) slower time-scale peaks. Consulting Figure 4, consider the placement of two red voltage measurement leads on your wrist, and keeping the black lead somewhere out ofthe way and stationary. This black lead is the ground, neither the positive nor the negative voltage lead. Figure 4 shows how the "ground" lead is like a comparison to both the positive node and the negative node that helps to reduce overall noise in the electronics. After reviewing the EKG interface resource guide for the equipment you'll be using for this lab. sketch your predicated electrode locations for your rst EKG measurements, including where you put your black lead