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Why do not action potentials occur during the repolarization phase?
It has to do with what types of channels are open during this phase. In the repolarization phase the number of potassium channels are increased and the number of sodium channels are decreased. This allows for action potentials to not occur. Otherwise, the action potentials would add up and produce tetany.
Does action potentials occur at nodes?
yes, the action potential occurs at the nodes of Ranvier -- there are Na (sodium channels) there that are depolarized/opened to maintain the 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
How does an action potential differ from a graded potential?
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
Where do most action potentials originate?
initial segment
Where do graded potentials occur?
On the dendrites and subsequently the soma (body) of neurons.
What is a tiny branching thread-like structure found in neurons?
There are two possible answers - axons or dendrites. Axons carry action potentials away from the neuron, while dendrites receive action potentials.
What role do dendrites play in transmission at chemical synapses?
Dendrites are the beginning of action potentials as they are formed and then propagate through a neuron. At the synapse, the dendrites receive the incoming signal from neurotransmitters released at the terminal of the previous neuron.
Where do most local potentials happen?
dendrites
Why do not action potentials occur during the repolarization phase?
It has to do with what types of channels are open during this phase. In the repolarization phase the number of potassium channels are increased and the number of sodium channels are decreased. This allows for action potentials to not occur. Otherwise, the action potentials would add up and produce tetany.
Does action potentials occur at nodes?
yes, the action potential occurs at the nodes of Ranvier -- there are Na (sodium channels) there that are depolarized/opened to maintain the action potential.
Do action potentials become weaker with distance?
action potentials are non-decremental and do not get weaker with distance.
What is the role of the neurons in transmitting electrochemical impulses?
They send the chemical impulses that are released at the synapses from the synaptic terminal of the axon of the first neuron. It merges from the dendrites to the second neuron.
The cell body of a neuron collects information from which structure?
The part of the neuron that picks up information and sends it to the cell body is the dendrite. Electrical stimulation is transmitted by upstream neurons onto dendrites, and the dendrites integrate and determine the extent to which action potentials are produced.
What is a dendron?
•For the dendritic crystal structure, see Dendrite (crystal).•Structure of a typical neuron Dendrite•Dendrite•Soma•Axon•Nucleus•Node ofRanvier•Axon Terminal•Schwann cell•Myelin sheath• Neuroscience Portal•Dendrites (from Greek δένδρον déndron, "tree") are the branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. Electrical stimulation is transmitted onto dendrites by upstream neurons via synapses which are located at various points throughout the dendritic arbor. Dendrites play a critical role in integrating these synaptic inputs and in determining the extent to which action potentials are produced by the neuron. Recent research has also found that dendrites can support action potentials and release neurotransmitters. This property was originally believed to be specific to axons.
Dendrites conduct both graded and action potential?
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
What do intercalated discs transfer from cell to cell?
action potentials, ionic currents, the force of contraction and ionic currents and action potentials only
