Otto Loewi demonstrated that neurons transmit signals across synapses by ____.
A) electrical signals
B) calcium channels
C) acetylcholine
D) chemical signals
E) proteins

Question

Quizplus · Accepted Answer

Otto Loewi demonstrated that neurons transmit signals across synapses by chemical signals. He conducted an experiment in which he stimulated the vagus nerve of a frog's heart, which slowed the heart rate. He then collected the fluid from the heart and applied it to a second frog's heart, which also slowed down. This showed that the chemical released from the first heart had caused the second heart to slow down.

Otto Loewi Demonstrated That Neurons Transmit Signals Across Synapses by ____