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.

Question

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.

Quizplus · Accepted Answer

The statement "The activity shown in these curves reflects the movement of negatively charged ions" is false. The activity shown in these curves reflects the movement of positively charged ions, specifically sodium, potassium, and calcium ions.

Refer to the Graph, Which Shows Ventricular Muscle Fiber Membrane