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Which membrane potential occurs because of the influx of Na plus through chemically gated channels in the receptive region of a neuron?
Wiki User
∙ 11y ago
An excitatory postsynaptic potential, a type of graded potential, occurs because of the influx of Na+ through chemically gated channels in the receptive region, or postsynaptic membrane, of a neuron. Graded potentials are generated by chemically gated channels, whereas action potentials are produced by voltage-gated channels.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoexcitatory postsynaptic potential
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Triggering of the muscle action potential occurs after?
Triggering of the muscle action potential occurs after acetylcholine binds to chemically-gated channels in the end plate membrane.
Potassium channels open late in the action potential to cause membrane?
...repolarization
What causes an action potential when it binds the motor end plate?
Chemically gated sodium channels open up when neurotransmitters bind to receptors in the motor end plate. This causes an action potential along a muscle membrane or nerve cell.
Opening sodium channels in the in the axon membrane causes?
Depolarization of the cell membrane. When the sodium channels open there is a rush of sodium ions down their concentration gradient into the cell. As they carry positive charge they reduce the potential difference (inside negative) across the membrane of the neuron.
What would happen if a chemically gated sodium channel in the postsynaptic membrane were completely blocked?
The nervous system would not work if ion channels were blocked. It would be like parking your car on a hose and trying to get water out of the hose.
Triggering of the muscle action potential occurs after?
Triggering of the muscle action potential occurs after acetylcholine binds to chemically-gated channels in the end plate membrane.
Plasma membrane exhibits chemically gated ion channels?
Yes, many cells have chemically gated ion channels. This means that the channel requires a specific chemical to open the gate and allow for things to pass through the membrane
Which ion channels open in response to a change in membrane potential?
voltage-gated ion channels
Are ion channels carbohydrates?
Ion channels are not carbohydrates but are pore-forming membrane proteins. One of their functions is to include establishing a resting membrane potential.
Potassium channels open late in the action potential to cause membrane?
...repolarization
What cause the membrane potential of a neuron?
Opening or closing of ion channels at one point in the membrane produces a local change in the membrane potential, which causes electric current to flow rapidly to other points in the membrane.
What causes an action potential when it binds the motor end plate?
Chemically gated sodium channels open up when neurotransmitters bind to receptors in the motor end plate. This causes an action potential along a muscle membrane or nerve cell.
The term voltage regulated means that the?
membrane voltage gated ion channels open and close with changes in the membrane potential
What has the author s Hagiwara written?
s. Hagiwara has written: 'Membrane potential-dependent ion channels in cell membrane' -- subject(s): Cell Membrane, Cell membranes, Ion channels, Ion exchange, Ion-permeable membranes, Membrane Potentials, Physiology
What effect of the action potential if sodium channels are kept closed?
The action potential will not generate if the sodium channels are kept closed.This is because the sodium channels are responsible for the dramatic rising phase of membrane depolarization that occurs when the threshold of activation is reached. As a membrane potential gradually depolarizes (which can occur for a variety of reasons such as neurotransmitter stimulation, mechanical deformation of the membrane, etc), that membrane potential gradually comes closer to that threshold of activation. Once that threshold is reached, the voltage gated sodium channels open and allow for a dramatic influx of sodium ions into the cell. This results in a rapid depolarization which is seen as the rising phase of that upward spike noted in an action potential. Without the ability to open these sodium channels we may reach the threshold of activation, but the actual action potential will not occur.
Effects of lidocaine on nerves?
it prevents sodium channels from opening which removes a neuron's resting membrane potential
The start of an action potential?
An action potential starts when sodium channels in a neuron end open and sodium ions rush is, depolarizing the neuron's membrane.
