Which description best defines the excitable gap in a reentrant circuit?

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Multiple Choice

Which description best defines the excitable gap in a reentrant circuit?

Explanation:
The excitable gap is the portion of tissue in a reentrant circuit that has recovered enough to be excited again when the circulating impulse arrives. As the wavefront travels, tissue behind it remains refractory (non-excitable), while the ahead tissue recovers and becomes excitable. That recovered, ready-to-fire segment is the excitable gap, and it allows the impulse to re-enter the loop and sustain the reentrant rhythm. The other options describe non-excitable or boundary areas, which don’t fit this concept.

The excitable gap is the portion of tissue in a reentrant circuit that has recovered enough to be excited again when the circulating impulse arrives. As the wavefront travels, tissue behind it remains refractory (non-excitable), while the ahead tissue recovers and becomes excitable. That recovered, ready-to-fire segment is the excitable gap, and it allows the impulse to re-enter the loop and sustain the reentrant rhythm. The other options describe non-excitable or boundary areas, which don’t fit this concept.

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