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Atrial Depolarization
The electrical activation of the atria of the heart, leading to atrial contraction and the initiation of the heartbeat.
Atrial Repolarization
The process of the heart's atrial muscle cells returning to their resting state after contraction, typically hidden in an EKG by the ventricular depolarization wave.
Threshold
The minimum level of stimulation required to trigger a neural impulse or a response in a sensory system.
Absolute Refractory Period
Portion of the action potential during which the membrane is insensitive to all stimuli, regardless of their strength.
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