Stress Physiology Flashcards
what are the main definitions of stress
- to emphasise certain words in speech
- a force applied to a body causing deformation or strain
- emotional or mental pressure
what are physical stressors
injury
surgery
infection
pain
exposure to cold
sustained exercise
what are threatening stressors
imprisonment, torture
what are the body systems that interact with each other during stress
nervous
endocrine
immune
what do the stress effects depend on
duration and severity of the stressor, and the effectiveness of any responses
what is involved in the alarm reaction
fight, flight or fright response
physiological effects
what occurs in the resistance phase
adapting to stressors
what occurs in the exhaustion phase
occurs when there is severe, persistent stress
responses are futile, and systems fail
there are pathological effects
describe the steps to the general adaption syndrome
alarm reaction
resistance phase
exhausation phase
what is the benefit associated with small levels of stress
increased attention and learning
what is the alarm reaction
this is the acute stress response including fight of flight
it is a physiological resopnse to a physical threat
neurological control from the sympathetic nervous system
hormonal control from the adrenal glands
describe the hormonal control of the acute stress response
adrenaline and corticosteroids
which gland produces corticosteroids
adrenal cortex
what is the gland that produces adrenaline
adrenal medulla
describe the impact of the alarm reaction on the cardiovascular system
increased cardiac output and redistribution of cardiac output