Action Potential
Trending Questions
How does the membrane potential inside a neuron change during an action potential?
First positive, then negative and again back to positive
First negative, then positive and again back to negative
First negative, then positive and continue to be positive
First positive, then negative and continue to be negative
After generation of action potential, the recovery process is called _____.
Depolarisation
Hyperpolarization
No change
Repolarisation
The diffusion of potassium ions out of a neuron after depolarisation causes : _____.
Depolarization
Repolarization
Nerve impulse
Action potential
An action potential is caused by an influx of _____ ions into the cell.
Sodium
Both Potassium and Sodium
Potassium
Calcium
An action potential is _____.
Outflux of negative ions to depolarize the membrane
Initiated by potassium ion movements
Outflux of positive ions to depolarize the membrane
Essential for nerve impulse propagation
During the propagation of a nerve impulse, the action potential results from the movement of ______.
K+ ion from extra cellular fluid to intra cellular fluid
Na+ ions from intra cellular fluid to extra cellular fluid
K+ ions from intracellular fluid to extra cellular fluid
Na+ ions from extra cellular fluid to intra cellular fluid
- (i) concentration gradient, (ii) high, (iii) opposite, (iv) low, (v) similar
- (i) electrochemical gradient, (ii) high, (iii) opposite, (iv) low, (v) similar
- (i) concentration gradient, (ii) high, (iii) similar, (iv) low, (v) opposite
- (i) electrochemical gradient, (ii) high, (iii) similar, (iv) low, (v) opposite
Action potential in a polarised neuron triggers _____.
Hyperpolarization
No change
Repolarisation
Depolarisation
Threshold potential is a state of depolarisation at which _____.
All of the above
An action potential is sure to fire
Voltage gated Na+ channels open
Membrane potential is near -55mV
Fill in the correct sequence for generation of Action potential in a neuron
Stimulus ⟶Inflow of Na+ ions ⟶ _(i)_____⟶Repolarisation ⟶___(ii)______
Transmission of Na+ Inflow of Na+ ions
Inflow of Na+ ions Transmission of Na+
Hyperpolarization Inflow of Na+ ions
Transmission of Na+ & K+ Hyperpolarization & RMP