Question

Phase 4 voltage in ventricular cells is stabilized by:

1) funny channels
2) L type Ca channels 2+
3) inwardly rectified K channels +
4) fast Na channels +
5) acetylcholine

Answer 1

Phase 4 voltage in ventricular cells is stabilized by inwardly rectified K+ channels, which maintain the resting potential by allowing potassium to leave the cell.

Step-by-step explanation:

The stage of ventricular cells known as phase 4 is characterized by a stable resting membrane potential. This stability is achieved by the action of various ion channels and influences. Specifically, inwardly rectified K+ channels play a crucial role in maintaining the resting potential of ventricular cells by allowing potassium to leave the cell, thereby stabilizing the membrane potential at its resting value.