A person encounters a growling Doberman dog during a morning walk and runs away with fear. Which of the following hormones has triggered this response?

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Epinephrine

Melatonin

Calcitonin

Thyroxine

answer is A.

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Detailed Solution

Epinephrine and norepinephrine augment the fight-or-flight response. By increasing the heart rate and force of contraction, epinephrine and norepinephrine increase the cardiac output and blood pressure. They also increase blood flow to the heart and skeletal muscles. In addition, they dilate airways to the lungs and increase blood levels of glucose and fatty acids.

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