In a hypothetical experiment, the blood flow between two dogs is joined and one dog is stressed so that its heart rate goes up rapidly. What will happen to the heart rate of the second dog?
A) It will remain calm because the heart rate is determined intrinsically in each heart.
B) Heart rate will go up due to an increase in epinephrine and norepinephrine in the blood.
C) Heart rate will go up due to signals from the first dog's SA node.
D) It will remain calm because there is no connection of the dogs' sympathetic nervous systems.
E) The heart rate of the second dog will decrease to compensate for the speed of the first dog's heart.

Question

Quizplus · Accepted Answer

When one dog's heart rate increases due to stress, the release of epinephrine and norepinephrine in its bloodstream will increase the heart rate of the other dog as well, due to the connection of their blood flow. Therefore, Choice B is the correct answer.

In a Hypothetical Experiment, the Blood Flow Between Two Dogs