Action potentials (AP) are triggered when the summation of all inputs onto a neuron bring the membrane potential above the AP threshold. Action potentials are usually triggered at the axon hillock, the area where the axon meets the cell body. Synapses located at the axon hillock are more effective than those in dendrites and the cell body because synapses at the hillock...Group of answer choicesdirectly activate ion pumps causing a larger voltage change at the axon hillockincreases the driving (net) force on sodium at the axon hillock making sodium channels more likely to open for an action potentialbypass passive electrical spread over long distances causing a larger voltage change at the axon hillockincreases the chemical force acting on potassiumincreases the axon’s membrane resistance causing a larger voltage change at the axon hillock

n action potential is triggeredQuestion 6Answera.only when we want it to be triggeredb.due to a change in the voltage across neuron membranec.in neurons and neuroglia

An action potential cannot begin unless the membrane at the axon hillock (trigger zone) reaches

Complete the sentences describing the events that occur during an action potential.An action potential will not occur unless the membrane potential at the (the initial segment of the axon) reaches a level called .When threshold is reached, of the initial segment open briefly, allowing to diffuse into the cell.As these ions enter the cell, the cell membrane undergoes , with the membrane potential increasing to a peak of approximately +30mV.As the peak of the action potential is reached, the sodium channels close and the open, allowing these ions to diffuse out of the cell.As cations leave the cell, the membrane potential at that part of the membrane once again becomes negative. This phase of the action potential is called , because the resting membrane potential is being reestablished.The membrane potential actually dips lower than -70mV because the potassium channels do not close quickly enough. This phase is called .

Each action potential Blank______.Multiple choice question.begins in the synaptic terminal and spreads up the axon to the axon hillockspreads across the entire surface of the membrane so that the entire cell is depolarized at one timeaffects only a small area of the plasma membrane of the cell at a timebuilds upon the previous action potential to create a larger potential change

109. One reason that action potentials are all-or-none is that a. they are always the same size in a given neuron. b. axonal membranes do not allow partial electrical responses to electrical stimuli. c. they must travel long distances without decrement. *d. once the membrane potential is past threshold, the influx of Na+ keeps driving it more positive until the maximum number of Na+ channels is