Loewi demonstrated that synapses operate by the release of chemicals 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

Question

​Loewi demonstrated that synapses operate by the release of chemicals 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

Quizplus · Accepted Answer

Loewi collected fluid from a stimulated frog's heart, transferred it to another frog's heart, and measured that heart rate. This experiment demonstrated that synapses operate by the release of chemicals (in this case, acetylcholine) which stimulate activity in the second frog's heart.

​Loewi Demonstrated That Synapses Operate by the Release of Chemicals

Loewi Demonstrated That Synapses Operate by the Release of Chemicals