Multiple Choice
When Otto Loewi placed the solution surrounding a frog heart whose heartbeat had been altered by vagal nerve stimulation into a second container with another frog heart, why did the second frog heart change its heartbeat similarly?
A) The first heart had depleted the oxygen in the solution.
B) The first heart had released waste products into the solution.
C) The solution had been heated by the first heart's activity.
D) The solution contained neurotransmitters released by the vagal nerve stimulation.
Correct Answer:
Verified
Correct Answer:
Verified
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