health

Fear is the emotion that people feel when they sense that they are in danger.
It is a protective emotion, which signals danger and helps a person to prepare
for and cope with it. Fear includes physical, mental, and behavioral
reactions.
The physical reaction to fear is called the “fight or flight” response.
Fight or flight is an involuntary response, a response that a person cannot
control consciously but that is controlled by the body’s nervous system.
It is the body’s way of preparing to run from danger or to fight. The heart
beats faster, and the blood pressure and breathing rate increase. Oxygenrich
blood rushes to the large muscles of the body, which are tensing to
prepare to fight. The pupils of the eyes grow larger to help the eyes scan
for danger. Epinephrine, also called adrenaline, is released to prepare
the body for quick action. Sweat is produced to cool the body.
Mentally, fear triggers thoughts about the danger or threat that the
person senses. These thoughts may size up the danger, anticipate what
might happen, or imagine ways to avoid harm. Behaviorally, the person
may startle or jump and then run, freeze, or get ready to fight.