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Neuron receives a series of stimuli whose effect is excitatory but subthreshold?
Then it does nothing unless the stimuli arrive at the same time to be above the threshold. Or the stimuli may undergo temporal summation (with buildup of neurotransmitters in the synapse), where their effects add up over time to be above the threshold.
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
What causes Local depolarization that leads to generate action potential?
Local depolarization is caused by the opening of voltage-gated sodium channels in response to the binding of neurotransmitters or other stimuli. This influx of sodium ions results in membrane depolarization, reaching the threshold potential needed to generate an action potential.
Does strong stimuli cause the strength of action potentials to increase?
No, it doesn't become "larger" - the peak potential is always the same - it is a digital signal. Stronger stimulus will cause the nerve cell to fire more often - therefore stimulus strength is translated as action potential frequency.
Where do neurotransmitters that bind the postsynaptic membrane generate?
Neurotransmitters that bind to the postsynaptic membrane generate a response by either depolarizing or hyperpolarizing the postsynaptic neuron. This response can lead to the generation of an action potential if the threshold is reached, propagating the signal further along the neuron.
What kinds of stimuli can elicit action potential?
Electrical , heat and chemical stimuli
Why does curare appear to generate an action potential?
It doesn't. I prevents an action potential from forming.
Neuron receives a series of stimuli whose effect is excitatory but subthreshold?
Then it does nothing unless the stimuli arrive at the same time to be above the threshold. Or the stimuli may undergo temporal summation (with buildup of neurotransmitters in the synapse), where their effects add up over time to be above the threshold.
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
What causes Local depolarization that leads to generate action potential?
Local depolarization is caused by the opening of voltage-gated sodium channels in response to the binding of neurotransmitters or other stimuli. This influx of sodium ions results in membrane depolarization, reaching the threshold potential needed to generate an action potential.
Does strong stimuli cause the strength of action potentials to increase?
No, it doesn't become "larger" - the peak potential is always the same - it is a digital signal. Stronger stimulus will cause the nerve cell to fire more often - therefore stimulus strength is translated as action potential frequency.
What is the resting potential refers to?
Resting potential refers to the electrical charge difference across the membrane of a neuron when it is not actively sending a signal. Typically around -70 millivolts, this potential is maintained by the distribution of ions, primarily sodium (Na+) and potassium (K+), across the membrane, along with the action of the sodium-potassium pump. This state is crucial for the neuron to be ready to respond to stimuli and generate action potentials when needed.
For a brief time after an action potential begins a muscle fiber or neuron cannot generate another action potential This time is called the?
five second silence
What are autorhythmic fibers?
They are fibres which generate AP(action potential) which trigger heart contractions.
What are the events that must occur to generate action potential?
Local polarization is the first step. Next the generation and propagation of an action potential. Lastly repolarization has to take place.
When action potential generate the internal part of the axon becomes______ due to influx of sodium?
Positive
Where do neurotransmitters that bind the postsynaptic membrane generate?
Neurotransmitters that bind to the postsynaptic membrane generate a response by either depolarizing or hyperpolarizing the postsynaptic neuron. This response can lead to the generation of an action potential if the threshold is reached, propagating the signal further along the neuron.
