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When a stimulus acts on a neuron it decreases the permeability of the stimulated point of its membrane to sodium ions?
Wiki User
∙ 14y ago
False
( When a stimulus acts on a neuron, it increases the permeability of the stimulated point of its membrane to sodium ions. )
Wiki User
∙ 14y ago
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WOULD A SUBSTANCE THAT DECREASES MEMBRANE PROBABILITY TO SODIUM INCREASE OR DECREASE THE PROBABILITY OF GENERATING A NERVE IMPULSE?
It would decrease the probability of generating a nerve impulse. When a neuron is activiated by a threshold stimulus, the membrane briefly becomes more permeable to sodium. If the permeability is decreased, it will be more difficult for the sodium ions to rush into the cell.
What is the past tense of stimulus?
Stimulus is a noun, not a verb. Only verbs have tenses.
Which is true of drugs that decrease membrane permeability to sodium ions?
It would decrease the probability of generating a nerve impulse. When a neuron is activiated by a threshold stimulus, the membrane briefly becomes more permeable to sodium. If the permeability is decreased, it will be more difficult for the sodium ions to rush into the cell.
Is conducting stimulus strong enough to generate a nerve impulse?
It depends on the strength of the stimulus. A threshold voltage has to be reached before the nerve can be stimulated.
An animal is an immediate automatic response to an external stimulus?
An animal's immediate automatic response to an external stimulus will vary depending on the circumstance. When the external environment is stimulated there is a response that is triggered.
An action potential is triggered if?
If a neuron, or other excitable tissue, is stimulated by a stimulus of threshold strength or greater strength..
What is involved in action potential?
also known as the "nerve impulse". with stimulus the permeability of the membrane to NA+ at the point of stimulation increase, and NA- ions rush into the cell causing the outside to lose its excess of positive ions. That location becomes depolarized only for an instant, and this produces an action potential.
A stimulus presented to a person or animal that decreases the probability of a particular response is known as?
Punishment by Application
What happens when a stimulus activates a receptor?
The activation of a second messenger inside the receiving cell, the triggering of enzyme activity in the cell, and the change of permeability of the cell.
There is a greater concentration of na plus and there is a greater concentration of k plus in the cell?
There is a greater concentration of Na plus outside and there is a greater concentration of K plus inside the cell. When the stimulus is delivered, the permeability of the membrane is changed, and Na plus diffuses into the cell, initiating the depolarization of the membrane.
When a nerve is activated by a threshold stimulus the membrane becomes more permeable to?
Potassium and Sodium
What is the type of feedback where the net effect is that the output of the system shuts off the original stimulus or reduces its intensity?
In a negative feedback loop, the output of the system decreases the intensity of the stimulus.
