A voltage-gated K⁺ channel that is also a delayed rectifier will
A)open very quickly in response to changes in membrane potential.
B)make it very difficult to start an action potential.
C)delay the start of an action potential.
D)open slowly,increasing the length of the action potential.

Question

Quizplus · Accepted Answer

A delayed rectifier K⁺ channel opens slowly in response to changes in membrane potential, leading to a prolonged repolarization phase of the action potential. This means that the length of the action potential is increased. This type of channel does not make it difficult to start an action potential, nor does it delay the start of one. Additionally, it does not open very quickly in response to changes in membrane potential, as this would be characteristic of fast-acting channels.

A Voltage-Gated K⁺ Channel That Is Also a Delayed Rectifier