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Chapter 3

Health Sciences 1001A/B Chapter Notes - Chapter 3: Raise Your Voice, Hypertension, Diabetes Mellitus Type 2

, Winter 2013
4 pages162 viewsWinter

Department
Health Sciences
Course Code
Health Sciences 1001A/B
Professor
Shauna Burke
Chapter
3

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Chapter 3
Stress: The Constant Challenge
What is stress?
Stress refers to:
1.) Situations that trigger physical and emotional reactions = stressors
2.) The reactions themselves = stress response
Stress = the general physical and emotional state that accompanies the stress response
Not only a physical reaction, also an emotional component
Response to Stressors
The primary determinant of health consequences of stress is how the individual responds to the
stress
Responses to stressors include:
o Physical changes
o Emotional and behaviours responses
Physical Responses to Stressors
Two control systems are responsible for the physical response to stressors:
1.) Nervous system
2.) Endocrine system
Nervous System
Consists of the Autonomic Nervous System which consists of:
1.) Parasympathetic Division
In control when you are relaxed
Aids in digestion, storing energy, growth promotion
2.) Sympathetic Division
Activated during arousal and emergency situations (pain, anger, fear)
Releases norepinephrine which commands body to mobilize energy resources to
respond to crisis and causes arousal (increases attention and alertness) when released
in the brain
Endocrine System
The system of glands, tissues, and cells that help control body functions by releasing hormones
and other chemical messengers into the bloodstream
Helps prepare the body to respond to a stressor
Nervous System + Endocrine System
Brain detects threat:
Neurochemical message sent to hypothalamus which releases chemicals to pituitary gland
which releases adrenocorticotropic hormone (ACTH) into bloodstream
ACTH reaches adrenal glands which release cortisol and other key hormones into the
bloodstream
Simultaneously:
Sympathetic nerves instruct Adrenal Glands to release the hormone epinephrine which triggers
several bodily changes
Examples: acute hearing and vision, increased heart rate, increased perspiration, etc.
Fight or Flight reaction (Sir Walter Cannon)
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