Changes

It includes a state of alarm and [[adrenaline]] production, short-term resistance as a coping mechanism, and exhaustion. It refers to the inability of a human or animal body to respond.  Common stress symptoms include irritability, muscular tension, inability to concentrate and a variety of physical reactions, such as headaches and elevated heart rate.<ref> Stress can occur in a variety of methods, including anxiety. Anxiety is a form of stress but may have diffrent symptoms, and diffent bodily reactions.[http://www.ehealthmd.com/library/stress/STR_whatis.html]

It includes a state of alarm and [[adrenaline]] production, short-term resistance as a coping mechanism, and exhaustion. It refers to the inability of a human or animal body to respond.  Common stress symptoms include irritability, muscular tension, inability to concentrate and a variety of physical reactions, such as headaches and elevated heart rate.<ref> Stress can occur in a variety of methods, including anxiety. Anxiety is a form of stress but may have diffrent symptoms, and diffent bodily reactions.[http://www.ehealthmd.com/library/stress/STR_whatis.html]

 

==Origin and terminology==

==Origin and terminology==

The term "stress" was first used by the [[endocrinologist]] [[Hans Selye]] in the 1930s to identify physiological responses in laboratory animals. He later broadened and popularized the concept to include the perceptions and responses of humans trying to adapt to the challenges of everyday life. In Selye's terminology,  "stress" refers to the reaction of the organism, and "stressor" to the perceived threat.  

The term "stress" was first used by the [[endocrinologist]] [[Hans Selye]] in the 1930s to identify physiological responses in laboratory animals. He later broadened and popularized the concept to include the perceptions and responses of humans trying to adapt to the challenges of everyday life. In Selye's terminology,  "stress" refers to the reaction of the organism, and "stressor" to the perceived threat.