PHYSIOLOGY
NEUROTRANSMISSION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
An action potential is generated when a ____ neural membrane becomes ____ by a rapid change in sodium and potassium ions moving across the membrane changing their ion concentrations on both inside and outside of the membrane.
|
|
structural, mechanical
|
|
|
depolarized, polarized
|
|
|
ependymal, motor neuron
|
|
|
polarized, depolarized
|
Explanation:
Detailed explanation-1: -To reestablish the appropriate balance of ions, an ATP-driven pump (Na/K-ATPase) induces movement of sodium ions out of the cell and potassium ions into the cell.
Detailed explanation-2: -Action potentials are caused when different ions cross the neuron membrane. A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron.
Detailed explanation-3: -Depolarization is caused when positively charged sodium ions rush into a neuron with the opening of voltage-gated sodium channels.
There is 1 question to complete.