After One Frog's Heart Has Been Stimulated, an Extract of Fluid

question 96

Multiple Choice

 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.

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