Entrance block --> protective block
An incompletely understood mechanism whereby a pacemaker is protected from being discharged by the impulse from another centre; the mechanism, usually conceived as an encircling zone of unidirectionally refractory tissue permitting egress of impulses from the centre but preventing access to the centre, is seen in operation in ventricular parasystole where the parasystolic centre is protected from discharge by the sinus pacemaker and so is able to maintain its intrinsic rhythm undisturbed.
Synonym: entrance block, protection.
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... 5m pp. 16-21 for the scientific basis of this effect. Referring to the block diagram of Figure 1 we see that the Head (1) of a person is connected ... pole. This phase control of battery charge emission, and battery charge entrance is managed by the oscillations of the quartz crystal in the clock ...
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