When Is an Action Potential Triggered?When is an action potential triggered?Multiple ChoiceWhen EPSPs exceeds IPSPsWhen potassium channels openWhen IPSPs exceeds EPSPsWhen chloride channels open

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

Excitatory postsynaptic potentials (EPSPs) move the membrane potential threshold. Inhibitory postsynaptic potentials (IPSPs) move the membrane potential threshold.

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 .

An excitatory postsynaptic potential (EPSP) occurs when neurotransmitters bind to their receptors and open chemically-gated ______ channels.Multiple choice question.sodiumpotassiumcalciummagnesium

If both IPSP's and EPSP's stimulate the same postsynaptic cell, which of the following is true?   Multiple choice question.The postsynaptic cell will likely never fire because of the conflicting input.The response of the postsynaptic cell depends on which type of graded potential has a larger effect.Only one of the stimulus types determines the effect in the postsynaptic cell