After one frog's heart has been stimulated, an extract of fluid from that heart can make a second frog's heart beat faster. What conclusion did Otto Loewi draw from these results?
A. Transmission at synapses is a chemical event.
B. The sympathetic and parasympathetic nervous systems are antagonistic.
C. Transmission at heart muscle synapses is electrical.
D. Hormones facilitate the actions of the nervous system.
Answer: A
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