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Chapter 11 - Emotional Behaviors

Terms in this set (58)

The HPA axis also linked stress and health
- HPA axis is language to describe the neural relationship between the hypothalamus, pituitary, and adrenal gland
○ hypothalamus releases releasing factors that then targets the pituitary land that releases tropic hormones that targets the adrenal cortex that releases its own hormone (cortisol)
- Yerkes Dodson law of arousal
○ a little bit of stress enhances your performance and immune system function
○ long-term stress is detrimental to performance and immune system function
○ inverted U in the relationship of arousal and performance

When we encounted an environmental stressor, it activated the amygdala and therefore the HPA axis
- HPA releases the stress hormone

High levels of cortisol are negative to the immune system

The functional idea is that one of the consequences of cortisol increase is to enhance metabolism and increase blood sugar
- if there's danger, you need more energy to deal with it
- but, that process of HPA engagement and rising cortisol levels has a metabolic cost (one on the immune system)

immune system struggles with long term stressors
- renders person more vulnerable to other kinds of assault

Stress immediately activates the sympathetic nervous system and more slowly activates the hypothalamus-pituitary-adrenal cotrex axis. The adrenal cortex releases cortisol, which increases metabolism.

Stress activates the immune system, helping to fight viruses and bacteria. The immune system releaes cytokines, which stimulate the hypothalamus by releasing prostaglandins, which cross the blood-brain barrier. THe hypothalamus reacts by activities to compat illness, including sleepiness, fever, and lack of appetite and energy.

Because stress causes release of cytokines, it can also lead to lethargy and other symptoms that resemble those of illness.