Question 1

QRS interval in Figure 4 is closest to
◦ 0.28 seconds.
◦ 0.30 seconds.
◦ 0.42 seconds.
◦ 0.10 seconds.
Question 2

The T wave in Figure 4 is
◦ upright.
◦ inverted.
◦ indicative of ventricular depolarization.
◦ indicative of sinus control of the ventricles.