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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.
How is an action potential self-regenerating?
depolarizing currents established by the influx of Na+ flow down the axon and trigger an action potential at the next segment
What principle states that the properties of the action potential are independent of the relative strength of the depolarizing stimulus?
the all-or-none principle
Dendrites conduct both graded and action potential?
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
What can occur when the effects of one graded potential are added onto the effects produced by another graded potential which can lead to an action potential?
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
What is a Difference between hyperpolarizing and depolarizing graded potential?
A hyperpolarizing graded potential makes the cell more negative, typically caused by an influx of chloride ions or efflux of potassium ions. In contrast, a depolarizing graded potential makes the cell less negative, often due to an influx of sodium ions or calcium ions. Both types of potentials play a role in generating action potentials in neurons.
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.
How is an action potential self-regenerating?
depolarizing currents established by the influx of Na+ flow down the axon and trigger an action potential at the next segment
What principle states that the properties of the action potential are independent of the relative strength of the depolarizing stimulus?
the all-or-none principle
Dendrites conduct both graded and action potential?
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
Is a postsynaptic potential a graded potential that is the result if a neurotransmitter released into the synapse between two neurons?
Yes it is true that graded potential can be called postsynaptic potentials. When a sensory neuron is excited by some form of energy, the resulting graded potential is called generator potential.
What is the difference between depolarizing and non-depolarizing drugs?
nondepolarizing meds act as an antagonist to acetylcholine at the myoneural junction in the muscle. Polarizing will mimick the effects of acetylcholine and cause membrane depolarization at the neuromuscular junction. In other words, look over your action potential.
What can occur when the effects of one graded potential are added onto the effects produced by another graded potential which can lead to an action potential.?
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
What can occur when the effects of one graded potential are added onto the effects produced by another graded potential which can lead to an action potential?
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
Why is an action potential is self-regenerating?
The Na+ diffusing into the axon during the first phase of the action potential creates a depolarizing current that brings the next segment, or node, of the axon to threshold.
Why is an action potential self-regenerating?
The Na+ diffusing into the axon during the first phase of the action potential creates a depolarizing current that brings the next segment, or node, of the axon to threshold.
How does graded potential occur?
Graded potential occurs when triggered by a stimulus and gated ion channels open these gated channels can either be chemically gated or mechanically gated. In order to have graded potential threshold must be met in order to generate action potential. Good day!
