The Characteristics of Action Potentials in Primo Vessels and the Effects of Acetylcholine Injection to the Action Potentials

<table>Representative time variation for period before and after injection. Under normal conditions, the pulses generated with a 2 s period. After acetylcholine injection, the period decreased gradually to half of the pre-injection value.</table>

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Figure 5

Figure 5: The Characteristics of Action Potentials in Primo Vessels and the Effects of Acetylcholine Injection to the Action Potentials 