The scenario described suggests that the neuro is experiencing a phenomenon known as spatial or temporal summation, where the input from several axonal knobs doesn't reach the threshold needed to trigger an action potential. This could be due to inhibitory inputs counteracting the excitatory signals, or the net depolarization may not be sufficient. Additionally, factors like the refractory period, ion channel dynamics, or the integration properties of the neuron's membrane could prevent impulse transmission despite the firing of multiple axonal knobs.
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