Stress Flashcards
(45 cards)
what is stress
the psychological and physiological state of tension in response to a stimulus
what is arousal
the state if being physiologically alert, awake and attentive
what is a stressor
a stimulus that causes stress
what is acute stress
stress that provides high levels of arousal for a short amount of time
what is chronic stress
stress that involves high levels of arousal and persists for long periods of time. it is harmful to one’s wellbeing
what is the fight-flight-freeze response
an involuntary, physical response to a sudden and immediate threat in readiness to either fight, flight or freeze
what are the fight and flight reactions activated by
sympathetic nervous system
what happens when we are confronted by a threat
heart rate and breathing rate increases, pupils dilate (to let as much light in as possible), more blood is directed to muscles to prepare the body to either fight or flight
what happens to the body is the threat is extremely overwhelming
the freeze reaction kicks in. the heart rate and blood pressure drops, and muscles lose their tension.
what is cortisol
the primary stress hormone
what does cortisol do
energises the body, allowing it to better deal with the stressor
what happens is there is high levels of cortisol over a prolonged period of time
reduces the efficiency of the immune system
what is the gut-brain axis (GBA)
a biochemical network of nerves that send signals between the gastrointestinal tract and the central nervous system
relationship between gut and brain**
the relationship is BIODIRECTIONAL meaning that the gut microbiota can affect the brain, but the brain can also affect the gut microbiota
what are microbiota
a large population of bacteria that live in the gastrointestinal tract
healthy vs unhealthy microbiota
healthy microbiota produces important hormones and neurotransmitters while unhealthy microbiota can cause inflammation and the release of anxiety-producing hormones
gut microbiota to brain
- alters levels of neurotransmitters
- neural plasticity
brain to gut microbiota
- serotonin, dopamine, adrenaline all affect the gut
- abnormalities in brain function can lead to GIT issues
- stress hormones shift gut microbiota
what is does GAS stand for
general adaptation syndrome
what is selye’s general adaptation syndrome
a three stage psychological response to stress that occurs no matter what the stressor is that is encountered
what are the 3 stages of the GAS model
- alarm reaction
- resistance
- exhaustion
what is alarm reactions subdivisions
shock and countershock
what happens in alarm reaction
the individual first becomes aware of the stressor. first the body goes into a temporary state of shock, and its ability to deal with the stressor decreases.
the body then goes into countershock, during which the sympathetic nervous system is activated and the body’s resistance to the stressor increases. adrenaline is released and heart and breathing rate increases.