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Is an action spike an impulse created by an excitable membrane when it reaches the threshold?
Yes, an action potential spike is generated when the membrane potential of a neuron reaches a certain threshold, causing a rapid depolarization and repolarization of the membrane. This creates a brief electrical impulse that propagates along the neuron's axon.
Which membrane potential results in depolorization without a nerve impulse being generated?
excitatory postsynaptic potential
What is the first step for nerve impulse generation?
The first step for nerve impulse generation is the depolarization of the cell membrane, which is triggered by a stimulus. This depolarization causes a change in the electrical charge of the cell membrane, leading to the opening of ion channels and the initiation of an action potential.
A neuron starts to fire an impulse by the influx of what ions?
A neuron fires an impulse by the influx of sodium ions into the cell. This creates a temporary change in the neuron's membrane potential, leading to depolarization and the generation of an action potential.
What is the external and internal change that causes a nerve impulse to be created?
A nerve impulse is generated when a neuron is stimulated by external factors, such as a chemical signal (neurotransmitter) or physical stimulus (like pressure or temperature). This stimulation leads to a change in the neuron's membrane potential, causing sodium channels to open and sodium ions to rush into the cell, resulting in depolarization. If the depolarization reaches a certain threshold, an action potential is triggered, allowing the nerve impulse to propagate along the axon. Internally, this change in ion concentrations and electrical charge is crucial for transmitting signals within the nervous system.
The abrupt shift in the charge of a neuron from a negative to a positive charge is known as?
It is probably called as action potential.
Is depolarization the same as contraction in the heart?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell.
Describe the events occurring in the cell membrane that permit the conduction of an impulse?
When a nerve impulse is conducted, the neuronal cell membrane undergoes changes in electrical potential. This starts with a rapid influx of sodium ions into the cell through voltage-gated sodium channels, depolarizing the membrane. This depolarization triggers the opening of adjacent sodium channels, resulting in an action potential that travels along the membrane. After the impulse passes, the sodium channels close, and potassium channels open, allowing potassium ions to exit the cell and restore the resting potential.
What is impulse in the nervous system?
electrical wave conducted along the nerve generated by the voltage difference across the cell membrane of the nerve cells.
How are action potentials related to impulses conducted along an axon?
Action potentials are rapid electrical signals generated by the depolarization of the neuron's membrane when the threshold potential is reached. As an action potential travels along an axon, it triggers the opening of voltage-gated ion channels, leading to a wave of depolarization that propagates down the axon. This sequential opening and closing of channels allows the impulse to travel quickly and efficiently, enabling communication between neurons and other cells. The myelin sheath, when present, further enhances this conduction speed through saltatory conduction, where the impulse jumps between nodes of Ranvier.
This type of potential is a brief electrical impulse produced by ions crossing the axon membrane?
The type of potential described is an action potential. It is generated by the movement of ions such as sodium and potassium across the axon membrane, leading to a rapid change in voltage that allows for the transmission of signals along the neuron.
What would a substance that decreases membrane premeability to sodium increase or decrease the probability of generating a nerve impulse?
A substance that decreases membrane permeability to sodium would decrease the probability of generating a nerve impulse. This is because sodium ions play a critical role in the depolarization phase of an action potential by entering the cell, so if their permeability is reduced, it hinders the ability to reach the threshold for generating an impulse.
