Question

The voltage-gated Na+ channels are ---------;

		Single-gated
		Double-gated
		Open upon Acetylcholine binding
		Allow fast influx of Na+ ions
		All of the above
		Only #2 and #4
		Only #2, #3 and #4

Answer 1

6th option is correct.

Options 2 and 4, double gated and fast influx of Na+ ions.

Explanation:

In the process of conduction of nerve impulse, voltage gated channels play a major role. They are two types of sodium voltage gated channels. Sodium activation and inactivation voltage gated channels.

In the depolarization process : The intial entry of sodium ions causes charge reversal from nagative to positive inside. It results in the opening of more and more sodium channels leading to a larger or fast influx of sodium ions. Called positive feedback regeneration.

Incorrect options :

Option 1: single gated.

Voltage gated channels of sodium cantains double gated which are sodium activation and inactivation voltage gated channels.

Option 3 : open upon the acetylcholin binding.

Sodium gated channels was not involved in the acetylcholin binding becausr acetylcholin interact with calcium voltage gated channels in synopsis transmission.