What hormone is primarily responsible for the "fight or flight" response?

The hormone primarily responsible for the "fight or flight" response is epinephrine. This hormone, also known as adrenaline, is released from the adrenal medulla in response to stress or danger. When the body perceives a threat, epinephrine prepares the body to either confront or flee from the situation, which is critical for survival.

Epinephrine triggers a series of physiological changes, including increased heart rate, elevated blood pressure, dilation of airways, and enhanced breakdown of glucose for energy. These changes ensure that muscles receive the necessary energy and oxygen to respond swiftly to the perceived danger.

Understanding the role of epinephrine in the "fight or flight" response is crucial for nursing care, particularly in assessing and managing patients experiencing acute stress or anxiety.