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Lecture 4

Lecture 4: Action Potential

QuestionAnswer
Membrane Potential differences in electrical charges between the inside and outside of the cell membrane
Depolarization membrane potential becomes more positive
Hyperpolarization membrane potential becomes more negative
Ionotropic Receptors ligand binds to a protein which changes conformation opening a channel allowing one or more ions to pass through it
Graded Potential local change of membrane potential resulting from a stimulation
EPSP excitatory post synaptic potential, depolarizing graded potential
IPSP inhibatory post synaptic potential, hyperpolarizing graded potential
Spread of Depolarization local currents created depolarize adjacent membrane areas and allow the wave of depolarization to spread
Longitudinal Resistance created by the cytoplasm which resists the spread of current
Transverse REsistance positive charges that enter the cell will leave it through the leakage channels
Action Potential brief reversal of membrane potential
Absolute Refractory Period 1 ms, sodium channel inactivated, no stimulus no matter how intense can generate another AP
Relative Refractory Period depends on the outward movement of potassium, sodium channels are closed but a strong stimulus can generate and AP
Nodes of Ranvier segments of the axon where there is no myelin
Created by: rlmurp09
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