Adrenalinefrisättning

Adrenalinefrisättning, also known as the fight-or-flight response, is a physiological reaction that occurs in response to a perceived threat or stressful situation. This response is orchestrated by the sympathetic nervous system and the adrenal glands, which release the hormone adrenaline (epinephrine) into the bloodstream. Adrenaline triggers a cascade of effects throughout the body designed to prepare an individual for immediate action.

Key physiological changes induced by adrenalinefrisättning include an increased heart rate, which pumps blood and oxygen more efficiently to muscles and vital organs. Blood pressure also rises, and breathing rate quickens to further enhance oxygen intake. Blood flow is redirected away from non-essential functions, such as digestion, and towards the muscles, providing them with the energy and strength needed to either confront the threat or escape from it. Pupils dilate, allowing for better vision in potentially low-light conditions. Glucose is released from the liver into the bloodstream, providing a quick source of energy.

While historically crucial for survival in the face of physical danger, modern stressors often trigger adrenalinefrisättning in situations that do not require physical exertion. Chronic or frequent activation of this response, without an appropriate outlet for the mobilized energy, can have detrimental long-term health consequences, including increased risk of cardiovascular problems and anxiety disorders. The intensity and duration of adrenalinefrisättning vary depending on the perceived severity of the stressor.