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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 .

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โˆ™ 2007-05-16 10:32:12
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Q: Why is the action potential generated in neurons only?
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A second nerve impulse cannot be generated until when?

The generation of a second action in some neurons can only happen after a refractory period, when the membrane potential has returned it's base level or even more negative. This is because some types of Na+ channels inactivate at a positive potential and then require a negative potential to reset. Other neurons have other types of channels and can fire multiple action potentials to a single depolarization.


What others cells are similar to neurons?

The only other cells that are similar to neurons in the body are the muscles cells because they both conduct an action potential, obey the All-or-None Law, and can be polarized and depolarized.


Why does the action potential only move away from the cell body?

The areas that have had the action potential are refractory to a new action potential.


Dendrites conduct both graded and action potential?

no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons


What factors affect the propagation of an action potential?

Here are the factors which affect the propagation of an action potential:1. Refractory periodDuring the absolute refractory period, a second action potential cannot be generated as the Na+ gates are inactivated. As for the relative refractory period, a second action potential can only be generated with a strong stimulus as some Na+ gates are still inactivated. This results in the action potential traveling in a unidirectional manner.2. Axon diameterThe larger the fiber, the less resistance there is to the local current flow. The impulse can hence be conducted more quickly. Smaller fibers have more resistance so the impulse travels more slowly.3. MyelinationSaltatory conduction is possible in myelinated axons. During saltatory conduction, the action potential is only generated at the myelin sheath gaps and the electric signal can jump rapidly from gap to gap. This allows the impulse to travel 30 times faster than in unmyelinated axons.


A neuron fires only when its membrane reaches what?

The Action Potential When a memrain reaches the the threshold potential. The threshold potential is around -55 mV.


Action potential will be propagated only after a sufficiently large resting membrane potential has been achieved in the direction of?

depolarization


Why is the cardiac muscle unusual?

The muscle has unique features that are only in the heart. These muscles are involuntary striated muscle which are only found in the wall of the heart. This is specialised muscle that can contract, Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves. Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity.


What is distinctive about cardiac muscle?

The muscle has unique features that are only in the heart. These muscles are involuntary striated muscle which are only found in the wall of the heart. This is specialized muscle that can contract, Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves. Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity.


What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

sarcoplasmic reticulum


What is unusual about the cardiac muscle?

The muscle has unique features that are only in the heart.These muscles are involuntary striated muscle which are only found in the wall of the heart. This is specialised muscle that can contract, Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves.Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity.Read more: Why_is_the_cardiac_muscle_unusual


A patellar reflex employs only what and motor neurons?

Sensory neurons and motor neurons.

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