LA. Action potential +40 Falled Threshold -55 initiations Resting state -70 Stimulus t Refractory period 2 3. Time (ms) Which of the following are true about the propagation of an action potential? Select all that apply The refractory period prevents propagation back to the point of initiation of the action potential Once initiated, the action potential propagates in an all or nothing fashion Action potential is triggered by the opening of voltage gated potassium channels O Once threshold pote ial is reached, the neuron always depolarizes Voltage (mV) Depolarization Repolarization

1. Why does the action potential not go back to where it came from? (Multiple answers possibly) the absolute refractory period prevents this from happening Sodium voltage gated ions in the area where the action potential just came from  are fully activated or inactivated Sodium voltage gated ions bind to the Na+ ions, preventing them from diffusing backwards Na+ only diffuses forward in the axon   2. When neurotransmitter binds to _______________ at the dendrites, it results in a _____________ potential Ligand gated ion channels | action Voltage gated ion channels | action Voltage gated ion channels | graded  Ligand gated ion channels | graded

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