The action potential is produced by the movement of ions across the cell membrane, specifically the influx of sodium ions followed by the efflux of potassium ions. This creates a change in voltage across the membrane, resulting in the depolarization and repolarization phases of the action potential.
The presynaptic cell that must have action potentials to produce one or more action potentials in the postsynaptic cell is the neuron releasing neurotransmitters at the synapse. When an action potential reaches the presynaptic terminal, it triggers the release of neurotransmitters into the synaptic cleft, which then bind to receptors on the postsynaptic cell membrane, leading to the generation of an action potential in the postsynaptic cell.
Action potentials can produce more rapidly when the influx of positive ions during depolarization occurs more quickly, leading to a faster rise in membrane potential. This can be influenced by factors such as the density of ion channels in the membrane, the myelination of the axon, and the strength of the stimulus triggering the action potential. Additionally, the speed of repolarization and the refractory period of the neuron can also impact the rate at which action potentials are generated.
No, hyperpolarization graded potentials do not lead to action potentials. Hyperpolarization makes the membrane potential more negative, which inhibits the generation of an action potential by increasing the distance from the threshold potential needed to trigger an action potential.
The regeneration of action potential is called "propagation." It involves the transmission of the action potential along the length of the neuron's axon.
Action potential
neurons
If a cell were depolarized twice the normal amount needed to produce an action potential, it would still only produce a single action potential. The all-or-none principle states that once the threshold for an action potential is reached, the neuron will fire with a fixed amplitude and duration regardless of the strength of the stimulus.
The presynaptic cell that must have action potentials to produce one or more action potentials in the postsynaptic cell is the neuron releasing neurotransmitters at the synapse. When an action potential reaches the presynaptic terminal, it triggers the release of neurotransmitters into the synaptic cleft, which then bind to receptors on the postsynaptic cell membrane, leading to the generation of an action potential in the postsynaptic cell.
Single action potentials follow the "all or none" rule. That is, if a stimulus is strong enough to depolarize the membrane of the neuron to threshold (~55mV), then an action potential will be fired. Each stimulus that reaches threshold will produce an action potential that is equal in magnitude to every other action potential for the neuron. Compound action potentials do not exhibit this property since they are a bundle of neurons and have different magnitudes of AP's. Thus compound action potentials are graded. That is, the greater the stimulus, the greater the action potential.
No, the amplitude of an action potential is constant and does not vary with the strength of the stimulus. Instead, the frequency of action potentials fired by a neuron can increase with a stronger stimulus.
Action potentials can produce more rapidly when the influx of positive ions during depolarization occurs more quickly, leading to a faster rise in membrane potential. This can be influenced by factors such as the density of ion channels in the membrane, the myelination of the axon, and the strength of the stimulus triggering the action potential. Additionally, the speed of repolarization and the refractory period of the neuron can also impact the rate at which action potentials are generated.
It creates an action potential
No, hyperpolarization graded potentials do not lead to action potentials. Hyperpolarization makes the membrane potential more negative, which inhibits the generation of an action potential by increasing the distance from the threshold potential needed to trigger an action potential.
Normally by arrays of photovoltaic cells; materials that produce a potential difference (voltage) across them under the action of light.
The regeneration of action potential is called "propagation." It involves the transmission of the action potential along the length of the neuron's axon.
Curare does NOT create an action potential. It binds to nicotinic acetylcholine receptors (which are primarily excitatory), and prevents the formation of an action potential.
action potential