9 -During depolarization: a- Voltage gated potassium channels open when the membrane potential reaches threshold value...

9 -During depolarization: a- Voltage gated potassium channels open when the membrane potential reaches threshold value b- Potassium ions move from outside the neuron to inside the neuron c- Sodium ions move from inside the neuron to outside the neuron d- Potential difference reaches +30 mv e- None of the above

Solutions

Expert Solution

Answer :-. NONE OF THE ABOVE.

Sodium - Potassium pump helps in maintaining negative membrane potential by pumping 3Na+ out of the cell for every 2 K+ into the cell.

Ligand - gated ion channels open allowing Na+ (or Ca2+) to depolarize the cell upto the threshold Voltage.

Once threshold is reached:-

Opening of Voltage gated sodium channels causes influx of Na+ inside the cell causing more positive charge inside the cell to help membrane potential to become more positive and cause Action potential.

K+ channels open at the time of repolarization ,which then moves potassium ions out of the neuron .

Resting Potential of neuron is -70mv. Peak of Action potential is +30mv . This means that the potential difference reaches 100mv.

gladiator answered 1 year ago

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