Question

20.3 cardiac muscle tissue and the cardiac conduction system
the plateau phase of the cardiac action potential is, in part, due to
○ voltage - gated slow calcium channels
○ voltage - gated potassium channels
○ voltage - gated fast sodium ion channels
○ ligand - gated channels

Explanation:

The plateau phase of the cardiac action potential is maintained by a balance between the influx of calcium ions through voltage - gated slow calcium channels and the efflux of potassium ions. Voltage - gated slow calcium channels play a key role in this phase. Voltage - gated potassium channels are more involved in repolarization, voltage - gated fast sodium ion channels are mainly for the initial depolarization phase, and ligand - gated channels are not the main contributors to the plateau phase of cardiac action potential.

Answer:

voltage - gated slow calcium channels