HLTC22H3 Lecture Notes - Reduced Affect Display, Allostasis, Hormesis
Document Summary
Three different major ways to describe stress: stress as a physiological state. Classic theories: cannon (1915) was the first physiologist to systematically describe the physiological effects of stress. He noted that cats exposed to barking dogs would respond with a rush of epinephrine or adrenaline into their systems. Stress activates the hypothalamus which readies organism for fight or flight: (sns)- reacts to stress in two ways, originates in the spinal column (preganglionic nerves- secrete acetylecholine) and radiate to the target organs (postganglionic nerves- use norephinephrine) Over activation of sns can result state of shock. Can cause blood level to get so low that cardiac arrest occurs. Porcine stress syndrome: pigs die simply from stress of being transported. Prolonged increases in blood pressure and blood clotting would eventually result in hypertension and cardiovascular disease. Selye = 1) hypothalamus secrets corticotrophin-releasing hormone (cha) activates pituatary which activates acth -> which activates corticosteroids such as = glucocorticoids and mineral corticoids.
