The Refractory Period definitions Flashcards
The Refractory Period definitions
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Refractory Period
A phase during an action potential where a neuron is less responsive to stimuli, ensuring distinct action potentials. Action Potential
A rapid rise and fall in voltage across a cell membrane, essential for nerve signal transmission. Absolute Refractory Period
A phase where no new action potentials can be initiated, ensuring unidirectional signal propagation. Relative Refractory Period
A phase following the absolute period where a stronger stimulus is needed to initiate an action potential. Voltage-Gated Sodium Channels
Membrane proteins that open in response to voltage changes, crucial for action potential initiation. Resting State
The state of a neuron when it is not transmitting an action potential, typically at -70 millivolts. Hyperpolarization
An increase in membrane potential making the inside of the cell more negative, occurring during the relative refractory period. Depolarization
A decrease in membrane potential, making the inside of the cell less negative, essential for action potential initiation. Unidirectional Propagation
The one-way travel of an action potential along an axon, ensured by the refractory periods. Neuronal Firing Rate
The frequency at which a neuron can generate action potentials, limited by the absolute refractory period. Potassium Channels
Membrane proteins that allow potassium ions to pass, involved in returning the cell to resting potential. Threshold
The critical level to which a membrane potential must be depolarized to initiate an action potential.
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