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1. electrical signals are sent through nerves.
2. Travels down axon.
3. k+ +Na+ ions flow down concentration gradients to restore equilibrium.
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∙ 13y ago
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Does atrial systole occur before or after the firing of the sinoatrial node?
The SA node makes the action potential for the heart. Atrial systole must occur after the action potential.
How can electrolyte imbalance control your heart function?
Electrolytes such as Sodium and potassium help the heart contract through a process called action potential. When the heart is at -60 MV the cell will open up allowing sodium into the cardiac cells causing a contraction. Look up action potential.
What does the sinoatrialnode release when it fires?
An action-potential which then travels to the Bundle of His and then the purkinje fibers to depolarize the ventricles to cause contraction.
Which part of the heart has the longest action potential?
The AV (atrioventricular node). Electrical conduction is slowed down at this node, and half the time of each action potential is spent on getting the signal through the AV node. This delay is to allow the ventricles to fill completely with blood before they get the signal to contract.
What is the function of the intercalated disc?
Basically, the cardiac action potential travel across them, making it easier for the electrical impulses to move quickely.
What is the earliest step in the generation of an action potential?
deporalization
Why is the action potential generated in neurons only?
may be there are specific arrangement of sodium and potassium ion channels in neurons which is not found in any other cell andthis arrangement is necessary for action potential generation but i am ot sure what kind of arrangement is needed for action potential generation and what kind is presentr in neurons and other cells .
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.
What ions enter the muscle cell during action potential generation?
sodium and potassium
The ions that enter the muscle cell during action potential generation are?
cacium ions
What is the result of inhibitory neurotransmission on the postsynaptic membrane?
Hyperpolarization of the membrane. This inhibits action potential generation.
Effects chlorine has on the generation and conduction of action potentials?
Influx of chloride ions into the neuron help to hyperpolarize the neuronal membrane, thus preventing the induction of an action potential. Therefore, chloride ions help to prevent generation of action potentials.
What is the period of time that elapses between the generation of an action potential and the start of muscle tension development in a muscle fiber?
latent period
A virus causes damage to the sodium channels of the postsynaptic neuron such that they open very slowly in response to a neurotransmitter How does this modify the generation of an action potential?
The sodium influx necessary for depolarization will occur more slowly making the action potential difficult to generate.
When do you use relative refractory period?
The relative refractory period is the time during which the generation of an action potential is impossible no matter the strength of the stimulus
WHAT are neurotransmitters are inhibitory?
neurotransmitters are called Inhibitory if the activation of the receptors causes hyper-polarisation and depresses action potential generation (slows down processes)
What substances plays a mojor role in generating the membrane potential of a neuron?
Well, for starters, membrane potential is a separation of charges across the membrane. So i think what you mean is "generating the action potential in a neuron". So in that case The substance that plays a major role in generating an action potential is Sodium (Na+). However, if you really mean membrane potential, there is only two substances associated with that and those are sodium (Na+) and potassium (K+).However, in truth, the generation of an action potential depends on the ligand and its receptor.
