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The velocity of the action potential is fastest in which of the following axons?
Wiki User
∙ 12y ago
a small myelinated axon
Wiki User
∙ 12y ago
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Do action potentials in the same neuron come in different sizes and shapes?
Yes, but that is not relevant. The important thing is the frequency of action potential
The four steps in the execution sequence of an After Action Review?
The beginning stage of an After Action Review is planning. Following the planning stage, in order, are preparing, conducting and following up.
Four steps in the execution sequence of an after action review?
The beginning stage of an After Action Review is planning. Following the planning stage, in order, are preparing, conducting and following up.
Which of the following is one of the four steps in the execution sequence of after action review?
mentoring
Which of the following is one of the four parts of the after action review?
Determine how to do the task differently next time.
Which type of axon will velocity of action potential conduction be the fastest?
Myelinated axons with the largest diameter
Which of the following would have the fastest conduction of an action potential?
myelinated, large diameter fibres
What does a conduction velocity of an action potential depend on?
An action potential does not have a conduction velocity. Rather, it makes sense to measure the conduction velocity of nerves or nerve cells and this is usually done in metres per second (m/s.). An action potential is characterised as "an all or none response". This means you cannot alter the characteristics of an action potential in a given nerve cell. If you get a nerve cell and manage to get it to threshold, produce and measure an action potential 1000 times or more at the exact same point on the cell, the action potential you measure will not change in timing or amplitude. Information travels down a nerve cell through action potentials. But it is not one action potential that travels the whole length of the axon. Instead what happens is that one action potential causes the next bit of the nerve cell to reach threshold and therefore creates an entirely new action potential. So you actually need multiple action potentials to happen along a nerve cell to send information down it. We call this "propagation of action potentials" since each action potential produces a new one. More properly, it is referred to as "saltatory action potential conduction". Conduction velocity is basically a measure of how quickly we can produce a series of action potentials to travel the distance of the nerve cell axon. Since action potentials only happen at each "Node of Ranvier", then the longer the distance between each node (internodal distance), the faster the conduction velocity of a nerve cell. Since the internodal distance is positively correlated with myelin thickness, more thickly myelinated nerve cells have faster conduction velocities. The thickest and fastest nerve cells are motor neurones and Ia fibres from muscle spindles with a diameter of 12-20 micrometres and a conduction velocity of 70-120 m/s. The thinnest/slowest are fibres used to convey slow pain (<1.5 micrometres and 0.5-2 m/s).
What type of cell enhances the velocity of electrical transmission of an action potential along an axon in the central nervous system?
Oligodendrocyte
What is the relationship between the action potential and the synapse?
A synapse and an action potential have a flip-flopping cause and effect relationship, in that an action potential in a presynaptic neuron initiates a release of neurotransmitters across a synapse, which can then subsequently potentially trigger an action potential in the axon of the postsynaptic neuron, which would then cause release of neurotransmitters across a following synapse.
What type of cell enhances the velocity of electrical transmission of an action potential along an axon in the peripheral nervous system?
Schwann Cells.
What are actions potentials?
In physiology, an action potential is a short-lasting event in which the electrical membrane potential rapidly rises and falls, following a consistent trajectoryAn action potential occurs when a neuron sends information down an axon, away from the cell body.
Is fastest an action verb?
No because you can't fastest.
Which of the following best describes the events of excitation in excitation-contraction coupling?
Propagation of the action potential along the sarcolemma
What was the effect of curare on eliciting an action potential?
It creates an action potential
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
The action potential is generated when a stimulus?
When a stimulus stimulates a neuron above the threshold, the action potential is generated.
