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Organization of Nervous System

An action pot...

Question

An action potential is sure to fire, once_________ channels are open.

A

Volatge gated Na+

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B

Voltage gated K+

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C

K+ leak channels

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D

Ligand gated Na+

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Solution

The correct option is A
Volatge gated Na+

An action potential is an all or none phenomenon, that is once the threshold potential of -55mV is reached it is sure to fire, if not there will be no action potential generated. The threshold potential is -55mV because at -55mV the voltage gated Na⁺channels open, which sets off a positive feedback loop leading to opening of more voltage gated Na⁺ channels in the next segment of the neuron, forming the action potential.

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At the membrane potential when voltage gated Na⁺ channels open, an action potential is sure to fire. This membrane potential is called _____.

At the membrane potential when voltage gated Na⁺ channels open, an action potential is sure to fire. This membrane potential is called _____.

Q. Match the following stages of action potential to its corresponding state of ion movement

I. Depolarization stage (p). (K⁺) ions move outside the cell
II. Repolarization stage (q). (Na⁺) ions move inside the cell
III. Hyperpolarization stage (r). No net ion movement
IV. Resting stage (s). (K⁺) ions move into the cell
V. Threshold potential (t). Ligand gated sodium channels open
VI. Stimulus reaches the neuron (u). Voltage gated sodium channels open

Q. If the 'Inactivation gates of sodum' are closed and 'potassium voltage gated channels' are open, in what phase is what phase is the 'action potential' in your body?

Q. Study the following events related to Na and K voltage-gated channels and find the correct combination:

S.No	Channel	Gate	Resting Phase	Depolarised	Hyperpolarized	Repolarisation	Speed of response
A	Na	Activation gate	Closed	Open	Open	Closed	Fast
B	Na	Inactivation gate	Open	Open	Closed	Slow
C	K	Activation gate	Closed	Closed	Open	Open	Slow

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