SAM pathway - Acute stress
SNS activation leads to...
- Increased pupil size
- Sweat glands produce more sweat
- Glycogen is stored in the liver and coverted to glucose for energy
- Increase in heart rate
- Release of adrenaline by the adrenal medulla
?FIGHT OR FLIGHT?
This is when you are energised to fight or flee in response to an acute stressor - the body is prepared for this by the SAM pathway
ANS - > SNS - > noradrenaline (physical response see above)
ANS -> adrenal medulla -> adrenaline
Pituitary-adrenal system - Chronic stress
Perception of stressor by higher brain centres
Cortisol causes stress effects in the body (negative feedback)
Consequences of the stress response
Cardivascular problems: If stress responses activated repeatedly heart and blood vessels suffer from abnormal wear + tear. Increased blood pressure (SNS activation) can lead to physical damage and increase likelihood of heart disease.
Immunosuppression: Too much cortisol suppresses the immune system, shutting down the process that fights infection.
Individual differences: Males tend to have fight or flight while females have a tend and befriend response to stress.