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A nerve is depolarized when there is a shift in the resting membrane potential towards more positive values, usually triggered by the opening of voltage-gated ion channels. This initiates an action potential that allows for the transmission of electrical signals along the nerve cell.
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Does a neuron become depolarized during an inhibitory postsynaptic potential?
False
What potentials are short-livedlocal changes in membrane potential that can be either depolarized or hyperpolarized?
Action potentials are short-lived, local changes in membrane potential that can be either depolarized or hyperpolarized. They are essential for transmitting electrical signals along neurons.
Do neurotransmitters always cause hyperpolarization of the postsynaptic membrane?
No, many neurotransmitters cause the postsynaptic membrane to be depolarized.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
What does it mean when a cell is depolarized?
Depolarization refers to the reversal of charges of neuron cell membrane, it occurs by moving in of 'Na' ions .
How is nerve impulse conducted along a myelinated nerve fiber?
In non-myelinated axons, the nerve impulse is going to be produced when the action potential accross a membrane makes a wave of depolarization followed by a wave of repolarization. With the absence of the myelin, the impulse is transmitted continuously throughout the membrane. In a non-myelinated nerve, once an end of the cell, the dendrite, is depolarized, the depolarization a.k.a., the action potential, moves along the nerve membrane, and the area of membrane immediately behind the depolarized section becomes repolarized.
What is a neurons charge when it is depolarized?
-70 millivolts
What is depolarized light?
Depolarized light refers to light in which the orientation of the electric field vectors is randomized in all directions. This means that the light is no longer vibrating in a single plane, making its polarization undefined. Depolarized light can be created by scattering or passing light through certain materials.
When a sodium channel opens and sodium rushes into a myocyte the cell membrane becomes?
depolarized, which triggers an action potential and leads to muscle contraction.
What are the three main states of a neuron?
polarized, depolarized, repolarized
What is a cell that is more positive than at rest is called?
depolarized
Does a neuron become depolarized during an inhibitory postsynaptic potential?
False
What potentials are short-livedlocal changes in membrane potential that can be either depolarized or hyperpolarized?
Action potentials are short-lived, local changes in membrane potential that can be either depolarized or hyperpolarized. They are essential for transmitting electrical signals along neurons.
Do neurotransmitters always cause hyperpolarization of the postsynaptic membrane?
No, many neurotransmitters cause the postsynaptic membrane to be depolarized.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
When a neuron is depolarized to threshold?
1. The neuron fires an action potential, sending the electrical signal down the axon.
What does it mean when a cell is depolarized?
Depolarization refers to the reversal of charges of neuron cell membrane, it occurs by moving in of 'Na' ions .
