?

Neuroscience

Free Version

Upgrade subject to access all content

Moderate

No Backward Propagation of Action Potential

NEURO-VLTJJG

One of the properties of action potential (AP) is that it propagates in only one direction.

Why does an action potential not propagate backwards?

Select ALL that apply.

A

Upstream voltage-gated ${ Na }^{ + }$ channels are inactivated and cannot reopen until the membrane repolarizes.

B

There are not enough ${ Na }^{ + }$ channels available upstream of the AP initiation site on the axon.

C

Upstream voltage-gated ${ K }^{ + }$ channels remain open briefly after the membrane repolarizes.

D

The currents do not flow backwards.