Refer to the Graph, Which Shows Ventricular Muscle Fiber Membrane

Multiple Choice

Refer to the graph, which shows ventricular muscle fiber membrane activity. Which statement about the graph is false?

A) Curve 1 depicts an action potential for ventricular muscle.
B) The sudden drop in curve 3 as it approaches 0.30 seconds is due to a closing of calcium channels.
C) The activity shown in these curves reflects the movement of positively charged ions.
D) The activity shown in these curves reflects the movement of negatively charged ions.
E) The activity shown in these curves depends on the opening or closing of voltage-gated channels.