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Lecture 3

Health Sciences 1001A/B Lecture Notes - Lecture 3: Autonomic Nervous System, Cortisol, Psychoneuroimmunology

Health Sciences
Course Code
HS 1001A/B
Shauna Burke

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Mindfulness Video
All it takes is ten minutes
Greater understanding of being present in the moment
Not to be overwhelmed with your emotions and to live in the present time
We cant change every little thing that happens in life but we can change the
way we experience
Ten minutes out of your day to step back and familiarize yourself with the
The goal is not to reduce stress, but to better experience, interpret stress and cope
with it.
Situations that trigger physical and emotional reactions are considered to be
The reactions themselves is the stress response
Stress: The general physical and emotional state that accompanies the stress
response. Stress can be positive or negative.
Response to stressors include
1.Physical changes
Emotional and behavioral responses
Physical Response to Stress
Nervous system
Peripheral :Autonomic nervous and Somatic Nervous system
Autonomic Nervous System: Part of the nervous system that is not under conscious
supervision. It is divided into parasympathetic and sympathetic divisions.
Chapter 3
Tuesday, October 2, 2018
11:31 AM
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Parasympathetic System: In control when you are relaxed, aids in digestion, storing
energy, growth promotion
Sympathetic Division: Activated during arousal and emergency situations. Released
norepinephrine which commands body to mobilize energy resources to respond to
Endocrine System
The system of glands, tissues and cells that controls body functions by releasing
hormones and other chemical messengers in the bloodstream. Helps prepare the
body to respond to a stressor
Nervous and Endocrine System
Brain detects threat.
Neurochemical messages are sent to the hypothalamus which releases
chemicals to pituitary gland which releases ACTH into bloodstream
ACTH reaches adrenal glands which releases cortisol and other key hormones
into the bloodstream.
Sympathetic nerves instruct adrenal glands to release the hormone epinephrine
(adrenaline) which triggers several bodily changes
Fight or Flight
Physical changes vary in intensity but the same physical reactions occur in
response to both positive and negative stressors.
A survival mechanism that is part of our biological heritage
Not often necessary, many stressors we encounter do not require a physical
We're hard wired to experience fight or flight
Your body works hard to maintain status quo. A state in which blood pressure,
heart rate, hormone levels and other vital functions are maintained within a
narrow range of normal.
Once a stressful situation ends, the parasympathetic division initiates the
adjustments necessary to restore homeostasis.
Anxiety lasts a long period of time and impacts a large area of your life. Anxiety may
not have a trigger
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