1. The QRS interval represents the conduction of the electrical impulse from the Bundle of His throughout the ventricular muscle and should normally be ________________________ seconds or smaller. a....

1. The QRS interval represents the conduction of the electrical impulse from the Bundle of His throughout the ventricular muscle and should normally be ________________________ seconds or smaller.

a. 0.20                   c. 0.18

b. 0.12                   d. 0.36

2. The heart has four chambers, two upper chambers and two lower chambers; the upper chambers are called:

a. Atria                  c. Septa

b. Ventricles       d. Branches