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]

<center>For lessons on the [[topic]] of '''''Stress''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Stress this link].</center>

<center>For lessons on the [[topic]] of '''''Stress''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Stress this link].</center>

==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.  

==History and usage==

==History and usage==

The term "stress" had none of its current general senses before the 1950s. As a semi-psychological term referring to hardship or coercion, it dated from the 14th century. It is a form of the[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''destresse'', derived via Old French from the [[Latin]] ''stringere'' – to draw tight.[http://www.ingentaconnect.com/content/bsc/jan/2004/00000045/00000006/art00013 Coping and stress: a conceptual analysis]

The term "stress" had none of its current general senses before the 1950s. As a semi-psychological term referring to hardship or coercion, it dated from the 14th century. It is a form of the[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''destresse'', derived via Old French from the [[Latin]] ''stringere'' – to draw tight.[http://www.ingentaconnect.com/content/bsc/jan/2004/00000045/00000006/art00013 Coping and stress: a conceptual analysis]

It had long been in use in [[physics]] to refer to the internal distribution of a force exerted on a material body, resulting in strain. In the 1920s and 1930s, the term was occasionally being used in psychological circles to refer to a mental strain or unwelcome happening, and by advocates of holistic medicine to refer to a harmful environmental agent that could cause illness. Walter Cannon used it in 1934 to refer to external factors that disrupted what he called "homeostasis".  

It had long been in use in [[physics]] to refer to the internal distribution of a force exerted on a material body, resulting in strain. In the 1920s and 1930s, the term was occasionally being used in psychological circles to refer to a mental strain or unwelcome happening, and by advocates of holistic medicine to refer to a harmful environmental agent that could cause illness. Walter Cannon used it in 1934 to refer to external factors that disrupted what he called "homeostasis".