1. The ability of cardiac pacemaker cells to generate their own electrical impulses spontaneously without external, or nervous, stimulation is known as: a. Automaticity                                ...

1. The ability of cardiac pacemaker cells to generate their own electrical impulses spontaneously without external, or nervous, stimulation is known as:

a. Automaticity                                 c. Conductility

b. Contractility                   d. Action potential

2. Which characteristic is specific to the pacemaker sites of the electrical conduction system (i.e., the SA node, the AV junction, and the Purkinje network fibers)?

a. Automaticity                                 c. Conductility

b. Contractility                   d. Excitability