no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
The dendrites portion of a neuron will generate a potential.
It causes the vesicles (which are in the axon terminal) to move to the cell membrane at the end of the axon terminal, where they merge with the cell membrane, releasing their load of neurotransmitters into the synaptic cleft (gap), where they quickly diffuse to receptors in the post-synapticneuron's dendrites, initiating a graded potential which moves down the dendrites, along the soma,to the axon hillock where it can cause an action potential in that secondneuron.
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
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.
It causes the vesicles (which are in the axon terminal) to move to the cell membrane at the end of the axon terminal, where they merge with the cell membrane, releasing their load of neurotransmitters into the synaptic cleft (gap), where they quickly diffuse to receptors in the post-synapticneuron's dendrites, initiating a graded potential which moves down the dendrites, along the soma,to the axon hillock where it can cause an action potential in that secondneuron.
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
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!
On the dendrites and subsequently the soma (body) of neurons.
No, dendrites do not release neurotransmitters. Dendrites are responsible for receiving neurotransmitters released by other neurons and transmitting those signals to the cell body of the neuron. It is the axon terminal that releases neurotransmitters into the synapse.
The entire signal travels in the neuron by a graded potential which is created in the dendrites and the body (soma) of the neuron, then it reaches a spot of the neuron which is called the axon-hillock where the signal now for the first time has encountered "voltage-gated channels" and now can create an Action potential that can propagate through the terminus of the neuron which is the length of the axon.
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.