What occurs when an ion channel is activated by the alpha subunit?

When an ion channel is activated by the alpha subunit, it typically leads to a change in membrane potential. This is because the alpha subunit of a G-protein coupled receptor has the ability to interact with and open ion channels in the membrane, allowing specific ions—such as sodium (Na+), potassium (K+), or calcium (Ca2+)—to flow in or out of the cell. This movement of ions alters the distribution of charge across the membrane, resulting in a change in membrane potential.

For example, if sodium channels are opened, an influx of sodium ions into the cell will cause the membrane potential to become less negative (depolarization). Conversely, if potassium channels open and potassium flows out, the membrane potential may become more negative (hyperpolarization). This change in membrane potential is critical for various physiological processes, including the generation and propagation of action potentials in neurons and muscle cells.

Other options, while related in the broader context of cellular signaling, do not directly address the immediate outcome of ion channel activation by the alpha subunit. A decrease in ion concentrations would imply a net outflow of ions from the cell, which contradicts the typical function of activated ion channels. The activation of receptors and decreased cellular communication might