Ion channels are one of the two classes of ionophoric proteins , along with ion transporters ( including the sodium - potassium pump , sodium - calcium exchanger , and sodium - glucose transport proteins ) .
Ion channels are present in the membranes of all excitable cells .
Ion channels are channels of the two classes of ionophoric proteins , along with ion transporters ( including the sodium - potassium pump , sodium - calcium exchanger , and sodium - glucose transport proteins ) .
Ion channels are present in the membranes of all excitable cells .