Presentation on theme: "The Stress Response BATs"— Presentation transcript:
1The Stress Response BATs A01 - Outline the biological response to stress
2What is Stress?A state of physiological or psychological strain caused by adverse stimuli (physical, mental, internal or external) that tend to disturb the functioning of an organism.
3Physiological Stress Response Sudden and severe stress generally produces:Increase in heart rateAlterations in digestive activitySkin becomes paleSweating increasesMuscular tremorsThese responses are produced by the Hypothalamic-Pituitary-Adrenal Axis (HPAA)
4Physiological Stress Response The stress response occurs when we are exposed to some sort of threat.It involves co-ordinated responses from a number of different systems and structuresHypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
5The Hypothalamus The hypothalamus is in charge of the stress response. The hypothalamus is in charge of the stress response.When a stress response is triggered, it sends signals to two other structures: the pituitary gland, and the sympathetic ganglia.HypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
6The Pituitary GlandThe pituitary gland controls the glands of the endocrine system.When activated by the hypothalamus it releases ACTH, which activates the adrenal cortex.HypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
7The Sympathetic Ganglia The sympathetic ganglia are connected to the internal organs. When activated they affect the functioning of the lungs, heart and digestive system.They are also connected to the adrenal medullaHypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
8The Adrenal CortexThe adrenal cortex releases chemicals called corticosteriods.These have a number of functions including releasing stored glucose and controlling swelling after injury.HypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
9The Adrenal Medulla The adrenal medulla releases adrenaline. The adrenal medulla releases adrenaline.This hormone stimulates the sympathetic ganglia, keeping their activity at a high level.HypothalamusPituitary glandSympathetic gangliaAdrenal cortexAdrenal MedullaFinish
10Fight or Flight Response Increaseoxygen intakeRelease storedglucoseDivert resourcesaway fromdigestionReady to expend energy,either by fighting or by running away
11The Fight or Flight Response An early evolutionary adaptation that is useful in dealing with physical threatsHelps us deal with short-term problems that can be solved by fighting or runningUnfortunately, many of the threats we face in our society do not fall into these categories…
12The Autonomic Nervous System The position of the Hypothalamus
14stressor hypothalamus Adrenal medulla Adrenal cortex cortisol Sympathetic branch of ANSPituitary glandAdrenal medullaAdrenal cortexAdrenaline and noradrenalinecortisolHPA axisSAM
15Over to you …Create a role play or poster to show the biological response to stress
16Plenary Complete the worksheet on the stress response Homework – log ontoYou have been assigned your first homework – complete the interactive activity relating to the stress response. Please complete it by next week – I will be able to access your responses via the website!!