Refer to the Graph Below of Ventricular Muscle Fiber Membrane

Multiple Choice

Refer to the graph below of ventricular muscle fiber membrane activity. Which of the following statements is false?

A) The activity shown in curve 1 is initiated by the opening of voltage-gated sodium channels.
B) The activity shown in curve 2 depicts the relative permeability of the membrane to sodium ions.
C) Curve 1 depicts an action potential for ventricular muscle.
D) The activity shown in curve 3 depicts the relative permeability of the membrane to potassium ions.
E) The extended plateau of curve 1 is due to sustained opening of voltage-gated calcium channels.