Stress Flashcards
What does the nervous system do?
conveys messages quickly using electrical signals which pass along neurons
What do the messages sent from the nervous system rely on
chemicals call neurochemicals
What is the CNS made up of
the brain and spinal cord
What does the peripheral nervous system contain
Sensory and motor pathways
What do the sensory and motor pathways in the PNS do
They enable the brain to be aware of the world and to control responses
What does PNS stand for
Peripheral nervous system
What part of the peripheral nervous system is involved in stress response
Autonomic nervous system
What does the ANS do
connects parts for example connects the heart and the glands with the adrenal medulla
What does ANS stand for
Autonomic nervous systems
What connects the heart and glands
the adrenal medulla
How many parts of the ANS is there
2
How many branches of the ANS are there
2
Name the 2 branches of the ANS
The sympathetic nervous system branch and the parasympathetic nervous system branch.
Role of the sympathetic nervous system
Leads to bodily arousal; increases heart rate and blood pressure
What does SNS stand for
Sympathetic nervous system
Role of the parasympathetic nervous system
Leads to bodily tranquillity
Role of ANA
part of the peripheral nervous system, regulates internal structures and systems, maintains physiological regulation of body.
glands with ducts are
Exocrine glands
Glands without ducts are
Endocrine glands
Describe the steps of sympathomedullary pathway
The brain perceives a stressor and the hypothalamus sends a signal to the sympathetic branch of the autonomic nervous system (ANS).
• The ANS initiates the fight or flight response, for example it increases heart rate and blood pressure.
• The ANS also causes the adrenal medulla to release the hormones adrenaline and noradrenaline into the blood.
• These hormones bind to special receptors on the heart, further stimulating heart rate and blood pressure.
• Both the ANS and adrenaline also mobilise carbohydrates to provide energy necessary for the fight or flight response.
Describe the pituitary adrenal system.
- The brain perceives a stressor, and the hypothalamus releases CRF which travels to the pituitary gland.
- This causes the pituitary gland to release ACTH into the blood.
- ACTH stimulates the adrenal cortex to release corticosteroids into the blood.
- Corticosteroids mobilise fat and protein reserves stored in the liver to provide energy necessary to maintain the fight or flight response
Describe Kiecolt-Glaser et al’s study using medical students.
- This was a natural expt. Levels of NK cell activity (DV) in medical students was measured during the stressful exam period or 1 month before (IV)
- Social isolation questionnaire also completed.
- There was lower NK cell activity (DV) at high stress time, and the greatest reduction was in those more isolated.
Explain one strength of Kiecolt-Glaser et al.
The study used a direct measure of immune function (levels of NK cells) so provides stronger evidence of immunosupression than studies (such as Cohen) which study the relationship between stress and illness.
Evalute Kiecolt-Glaser et al. in terms of two weaknesses.
As a natural expt. there is an issue over causality: the IV was not manipulated nor extraneous variables controlled. For example perhaps there is fluctuation in NK cell activity: e.g. NK cells may be less active in the summer during exam time than in the winter and it could be this (rather than the stress caused by exams) which accounted for the results.
The results have been found to be unreliable. Exams count as a brief naturalistic stressor. In their meta analysis Segestrom and Miller found brief naturalistic stressors to have no overall effect on immune function.