When an individual is confronted with a potentially harmful situation, the adrenal glands release epinephrine (adrenaline). Epinephrineprepares the body for action by increasing the heart rate and bloodglucose levels. Explain the advantages or disadvantages associatedwith a shorter half-life for epinephrine, such as when it is released asa neurotransmitter, and those associated with a longer half-life, suchas when it is secreted as a hormone.

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