Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
if the graded potential of threshold size reaches a trigger zone
The dendrites portion of a neuron will generate a potential.
graded potential are by definition VARIABLE in strength, and therefore NOT all or none. They start out at their strongest strength, and degrade (become weaker) as they progress further along.
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
More sodium ions pile up (accumulate) at the axon hillock from the combination of the two (or more) graded potentials, which may be then be sufficient to initiate the action potential.
if the graded potential of threshold size reaches a trigger zone
Graded potential occurs when triggered by a stimulus and gated ion channels open these gated channels can either be chemically gated or mechanically gated. In order to have graded potential threshold must be met in order to generate action potential. Good day!
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.
Yes it is true that graded potential can be called postsynaptic potentials. When a sensory neuron is excited by some form of energy, the resulting graded potential is called generator potential.
A hyperpolarizing graded potential makes the cell more negative, typically caused by an influx of chloride ions or efflux of potassium ions. In contrast, a depolarizing graded potential makes the cell less negative, often due to an influx of sodium ions or calcium ions. Both types of potentials play a role in generating action potentials in neurons.
The frog schiatic nerve gives a graded response because the nerve is a bundle of axons and not a single axon (thus it does not show the all or none response of an axon-either generating an action potential or not). If one axon is generating an action potential then a small nerve impulse is witnessed, if all axons are simultaneously generating action potentials then a large nerve impulse is witnessed. Thus the nerve impulse is graded (it can be none, small, medium, large, larger, maximal).
End plate potential is the change in potential from neurotransmitters. It can be excitatory or inhibitory. If the action potential wants to continue, it will be excitatory and vice versa. It can be additive, if more action potentials are fired it will increase the end plate potential. An action potential is an all or none response. It will either proceed or it will not proceed depending on the terms of the threshold. It cannot be additive, because there is an absolute refractory period where no additional action potentials can be fired.
Receptor potential or generator potential.
Receptor potential or generator potential.