1. Which of the following statements is false?
a. The action potential of a cardiac contractile cell has aplateau.
b. The action potential of a cardiac contractile cell has threephases.
c. The action potential of a cardiac contractile cell has agradual depolarization.
d. The action potential of a cardiac contractile cell returns torest.
2. The electrical axis of the heart corresponds to:
a. The conduction of the heart
b. The cardiac contractile cell action potential
c. The cardiac nodal cell action potential
d. The orientation of the heart
