During active breathing, bursts of action potentials are observed to occur
A) synchronously in the inspiratory and expiratory motor neurons.
B) exclusively in the inspiratory motor neurons.
C) exclusively in the expiratory motor neurons.
D) asynchronously in the inspiratory and expiratory motor neurons.
E) simultaneously in the inspiratory and expiratory motor neurons.
Answer: D) asynchronously in the inspiratory and expiratory motor neurons.
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