Ions can move across the plasma membrane in all of the following ways except A)through voltage-gated channels along the axolemma. B)through passive or leak channels. C)by ATP-dependent ion pumps like the sodium-potassium exchange pump. D)through chemically-gated channels as in neuromuscular transmission. E)diffusion directly through the plasma membrane.

Question

Quizplus · Accepted Answer

Diffusion directly through the plasma membrane is not a way that ions can move across the plasma membrane. This is because the plasma membrane is selectively permeable and does not allow ions to freely diffuse through it. Instead, ions must use channels or pumps to cross the membrane, as listed in the other answer choices.

Ions Can Move Across the Plasma Membrane in All of the Following