Loewi Demonstrated That Synapses Operate by the Release of Chemicals

Loewi demonstrated that synapses operate by the release of chemicals. He did this by:

A) applying adrenaline directly to the heart muscle.
B) collecting fluid from a stimulated frog's heart, transferring it to another frog's heart, and measuring that heart rate.
C) measuring the speed of a dog's reflexes while the dog was under the influence of various drugs.
D) applying an extract of marijuana in eye drops and discovering that it dilated the pupils.

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