0
What else can I help you with?
B What are the major events of an action potential and what ion changes are associated with each event?
During an action potential, the major events include depolarization (sodium channels open, sodium ions enter the cell), repolarization (potassium channels open, potassium ions leave the cell), and hyperpolarization (potassium channels close slowly leading to an overshoot of the resting membrane potential). Sodium influx causes depolarization, while potassium efflux causes repolarization and hyperpolarization.
What is the difference between a compound action potential and a single action potential?
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.
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
What is another name for an action potential in neuroscience?
In neuroscience, another name for an action potential is a nerve impulse.
What structure in the neuron accelerates the transmission of the action potential?
The structure in the neuron that accelerates the transmission of the action potential is called the myelin sheath.
What makes sure that there is one action potential in the neuromuscular junction for one action potential in the muscle?
After a neuron fires, there is a refractory period where certain factors in the neuron prevent it from being depolarized again. This is made possible by an "overshoot" of polarization (returning to a much stronger negative ion charge inside the neuron) after the action potential passes. This ensures that voltage-controlled ion channels remain closed for a small period of time and do not become overactive through continuous restimulation.
B What are the major events of an action potential and what ion changes are associated with each event?
During an action potential, the major events include depolarization (sodium channels open, sodium ions enter the cell), repolarization (potassium channels open, potassium ions leave the cell), and hyperpolarization (potassium channels close slowly leading to an overshoot of the resting membrane potential). Sodium influx causes depolarization, while potassium efflux causes repolarization and hyperpolarization.
What was the effect of curare on eliciting an action potential?
It creates an action potential
What makes the coil overshoot the vertical?
Coil overshoot the vertical due to the inertia of the mass attached to the spring when it is displaced. As the spring is compressed or stretched, it stores potential energy, which gets converted to kinetic energy as it returns to equilibrium. If the energy transfer is rapid and the damping is insufficient, the mass can overshoot the vertical position, causing it to oscillate above and below that point. This behavior is typical in systems with low damping and high stiffness.
Will a hyperpolarization graded potential lead to 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.
What is the hyperpolarization that occurs after repolarizing phase of action potential?
Hyperpolarization occurs because some of the K+ channels remain open to allow the Na+ channels to reset. This excessive amount of K+ causes hyperpolarization so the Na+ channels open to bring the potential back up to threshold.
What is the regeneration of action potential called?
The regeneration of action potential is called "propagation." It involves the transmission of the action potential along the length of the neuron's axon.
Why does curare create an action potential?
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.
Also called a nerve impulse transmitted by axons?
action potential
Why does curare appear to generate an action potential?
It doesn't. I prevents an action potential from forming.
What transmission of the depolarization wave along the neurons membrane?
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.
