Explain the significance of what Loewi observed in his experiment with the two frog hearts.
A. It showed that neurons communicate with muscle by electrical signals.
B. It suggests that a chemical substance released from the first heart, when added to the second heart, reproduced the effects of electrical stimulation.
C. It suggests that all vertebrate hearts receive both inhibitory and excitatory signals from different nerves.
D. It showed that nerves have a direct electrical effect on heart muscle.
B. It suggests that a chemical substance released from the first heart, when added to the second heart, reproduced the effects of electrical stimulation.
You might also like to view...
Folding domains typically range in length from ____________ amino acids
A. 1,000 to 1,5000 B. 10 to 20 C. 200 to 275 D. 50 to 80 E. 25 to 100 or more
A _______ translocation represents when a piece of one chromosome is attached to another chromosome
A. simple B. complex C. reciprocal D. balanced
What is released at each step in an electron transport chain?
A. carbon dioxide B. photons C. ultraviolet wavelengths D. energy E. electrons
Systematics holds that the more similar the DNA of two organisms, the more closely related they are
Indicate whether the statement is true or false