Question

If there is less of this current, a ventricular action potential will likely prolong. This problematic and can be seen in diseases like long QT syndrome. This current is:

1) Na⁺ current
2) T-type calcium current
3) either Ito or Kr/Ks
4) L-type calcium current

Answer 1

The current that is likely to prolong a ventricular action potential is the L-type calcium current. By blocking these channels, the movement of calcium ions is impeded, leading to a prolonged action potential.

Step-by-step explanation:

The current that is likely to prolong a ventricular action potential is the L-type calcium current. The L-type calcium channels play a key role in the influx of calcium ions during the plateau phase of the action potential in cardiac contractile cells. By blocking these channels, the movement of calcium ions is impeded, leading to a prolonged action potential. This can be seen in diseases like long QT syndrome, where the action potential duration is abnormally prolonged.