if the stimulus is still there after the first action potwntial at the initial segment of the axon some of rhe Na+ ions that entered through that spot __ downward towards the termina
Added by Terri M.
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The question is about the behavior of Na+ ions after an action potential is generated at the initial segment of an axon. Show more…
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When an action potential occurs, it involves initially ions going into the axon, followed by ions leaving the axon. An action potential travels along the axon. Its speed is increased by its goal, which is to ultimately lead to the release of neurotransmitters. This release affects the next target neuron by producing an IPSP (which decreases the likelihood that the target neuron fires) or producing an EPSP (which increases the likelihood that the next neuron fires).
Dominador T.
Ordinarily, the beginning of a neuron's axon (near the cell body) is activated before any other part of the axon, so a wave of action potentials occurs as sodium channels open in the direction of the synaptic terminal. What would happen if you artificially stimulated an axon to reach threshold potential midway along its length, rather than at the connection with the cell body?
Why do action potentials travel in one direction, from the axon hillock to the axon terminal? The brief refractory period of voltage-gated Na+ channels prevents them from reopening behind the action potential The Na+/K+ pump uses ATP to depolarize the membrane only ahead of itself The higher resting membrane potential at the axon hillock than at the axon terminal forces the action potential to go down its gradient Ligand-gated channels in the membranes of axons only open in the direction of the axon terminal The inactivation loop associated with voltage-gated K+ channels only allows ions to move in the direction of the axon terminal
Suman K.
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