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An action potential needs to occur to trigger the neurons but the action potential depends on whether a stimulus is able to bring the membrane potential to a certain level termed the THRESHOLD. This threshold is about -55 mV for most neurons, but the stimulus needs to bring the membrane potential to this certain level or it will not be triggered. Relating to the ALL-OR-NONE PRINCIPLE, which if the threshold is not acquired then an action potential will not occur but once a stimulus is strong enough to depolarize (making the inside of the cell less negative going from -70 mV to -55 mV) it will trigger. The resting potential is -70 mV which the stimulus needs to bring it up to -55mV.
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What is the amount of stimulation required to intiate a nerve impulse called?
The amount of stimulation required to initiate a nerve impulse is called the threshold potential. This is the minimum level of depolarization needed to trigger an action potential in a neuron.
What are the sources of stimulation that start a nerve impulse?
Sources of stimulation that can start a nerve impulse include chemical signals (neurotransmitters released at synapses), physical stimuli (such as pressure or temperature changes acting on sensory receptors), and electrical signals (generated by neighboring neurons or external electrical sources). These stimulations can trigger the opening of ion channels in the neuron's membrane, leading to changes in membrane potential and initiation of an action potential.
Can subthreshold stimulation cause an action potential?
No, subthreshold stimulation is not sufficient to trigger an action potential. The membrane potential needs to reach a certain threshold level for an action potential to be generated. Subthreshold stimulation only produces graded potentials that do not reach the threshold for firing an action potential.
What is stimulus threshold?
ST - In regards to excitable cell (i.e. neurons) the minimum mV need to trigger a AP (action potential) and is around -40mV (although this may vary depending on the cell). In additional to this; excitable cells (i.e. neurons) shows an all-or-nothing property, such that if the stimulus threshold is not met the action potential will not be created.
What does threshold mean in a muscle or nerve cell membrane?
In muscle or nerve cell membranes, the threshold refers to the minimum level of stimulation needed to trigger an action potential, which is the electrical signal that allows these cells to communicate and function. Once the threshold is reached, it initiates a rapid depolarization of the cell membrane, leading to the propagation of the action potential.
What is the amount of stimulation required to intiate a nerve impulse called?
The amount of stimulation required to initiate a nerve impulse is called the threshold potential. This is the minimum level of depolarization needed to trigger an action potential in a neuron.
What are the sources of stimulation that start a nerve impulse?
Sources of stimulation that can start a nerve impulse include chemical signals (neurotransmitters released at synapses), physical stimuli (such as pressure or temperature changes acting on sensory receptors), and electrical signals (generated by neighboring neurons or external electrical sources). These stimulations can trigger the opening of ion channels in the neuron's membrane, leading to changes in membrane potential and initiation of an action potential.
What is the minimal intensity of stimulation necessary to trigger a muscle contraction?
threshold stimulus
What is minimum firing angle?
It means the minimum current can trigger the SCR to operate.
Excruciating facial pain upon stimulation of a trigger zone?
Bootje patrick...bootje
Which of the stimuli resulted is the most effective nerve stimulation?
Electrical stimulation is typically the most effective method for nerve stimulation as it can directly trigger action potentials in the nerve fibers. Light and chemical stimuli can also stimulate nerves but are generally not as precise or efficient as electrical stimulation.
Why does the heart pumps when the person is scared?
We have sympathetic and parasympathetic nerves. When we are fightened or scared, sympathetic nerves trigger impulse into the brain in order to release adrenaline. This adrenaline makes the heart beat faster because more oxygen is required. This helps us cope from stress.After a while parasympathetic nerves send impulse to reduce the release of adrenaline and the heart starts beating normally
Can subthreshold stimulation cause an action potential?
No, subthreshold stimulation is not sufficient to trigger an action potential. The membrane potential needs to reach a certain threshold level for an action potential to be generated. Subthreshold stimulation only produces graded potentials that do not reach the threshold for firing an action potential.
What is critical charge?
"Critical charge" typically refers to the minimum amount of energy required to trigger a specific reaction or process. In chemistry, this can relate to the activation energy needed for a chemical reaction to occur. In electronics, it may refer to the threshold voltage required to induce conduction in a semiconductor device.
What is stimulus threshold?
ST - In regards to excitable cell (i.e. neurons) the minimum mV need to trigger a AP (action potential) and is around -40mV (although this may vary depending on the cell). In additional to this; excitable cells (i.e. neurons) shows an all-or-nothing property, such that if the stimulus threshold is not met the action potential will not be created.
What can trigger the knifelike pain of trigeminal nerualgia?
Stimulation of the face, lips, or gums, such as talking, eating, shaving, tooth-brushing, touch, or even a current of air, may trigger the severe knifelike or shocklike pain of trigeminal neuralgia.
Can fingering trigger a girl's period?
No, fingering cannot trigger a girl's period. Menstruation is controlled by hormonal changes in the body, and physical stimulation like fingering has no impact on the menstrual cycle.
