F.P Exam 1 Extra Questions (Quizzes & Ans) 2024.primary determinant of resting membrane potential is Answer- K+ permiability where do most action potentials being Answer- in the initial segment what opens first in response to a threshold stimulus? Answer- Voltage Gated Na+ channels how is action potential propagated along an axon? Answer- influx of sodium ions from current action potential depolarizes the adjacent area why do actin potentials move away from the body Answer- areas that have had action potential are now in refractory period for a new action potential in what type of axon will velocity of the AP conduct the fasted? Answer- myelinated large diameter being myelinated means what for resistance? Answer- myelinated means more resistance to leak so faster conduction job of myelin Answer- increase conduction by decreasing leak
type of conduction we see in myelinated vs. unmyelinated Answer- myelinated:
saltatory
unmyelinated: continuous
why does action potential regenerate Answer- depolarizing currents are established by influx of Na flow down the axon flow triggers an AP to the next segment why does regeneration of AP occur in 1 direction rather than 2? Answer- inactivation gates of voltage gated Na+ channels close in the node or segment that has just fired an action potential where are neurotransmitters stored Answer- in the axon terminals of the presynaptic neruon
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