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Local polarization is the first step. Next the generation and propagation of an action potential. Lastly repolarization has to take place.
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List the events that occur in an action potential?
In simplest terms, the five stages of action potential are... A. Action Potential B. Depolarization C. Recovery Phase D. Refractory Period E. Hyper-polarization
Is a action potential necessary for a nerve impulse to occur?
Yes, an action potential is needed for a nerve impulse to occur.
Is an action potential necessary for a nerve impulse to occur?
Yes, an action potential is needed for a nerve impulse to occur.
Is it possible to have a partial action potential?
No, action potentials are all-or-nothing events that either reach their full potential or do not occur at all. Once the threshold is met, the action potential will propagate along the neuron without diminishing in strength.
Why does hyperpolarization cause a spike to occur?
Hyperpolarization causes a spike to occur because it increases the difference in electrical charge between the inside and outside of a neuron, making it more likely for the neuron to generate an action potential or spike.
Does atrial systole occur before or after the firing of the sinoatrial node?
The SA node makes the action potential for the heart. Atrial systole must occur after the action potential.
Does action potentials occur at nodes?
Yes, action potentials occur at the nodes of Ranvier in myelinated neurons. The myelin sheath insulates the axon, forcing the action potential to jump from node to node, a process known as saltatory conduction. This allows for faster conduction of the action potential along the axon.
Which term is defined as the sequential pattern of events as they occur in a story?
Plot is the term defined as the sequential pattern of events as they occur in a story. It includes the exposition, rising action, climax, falling action, and resolution.
What term is defined ass the sequential pattern of events as they occur in a story?
The term defined as the sequential pattern of events as they occur in a story is "plot." The plot encompasses the arrangement of events in a narrative, including the exposition, rising action, climax, falling action, and resolution.
A virus causes damage to the sodium channels of the postsynaptic neuron such that they open very slowly in response to a neurotransmitter How does this modify the generation of an action potential?
This modification would likely result in a delayed or weakened depolarization of the postsynaptic neuron membrane. As a consequence, the generation of an action potential may be slower or fail to reach the threshold needed to trigger an action potential, leading to impaired signal transmission between neurons.
Why does hyperpolarization occur in neuronal cells?
Hyperpolarization occurs in neuronal cells when the cell's membrane potential becomes more negative than its resting state. This happens because of an increase in the outflow of potassium ions or an influx of chloride ions, making it harder for the neuron to generate an action potential.
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.
