BIO 211 Lecture Notes - Lecture 6: Stress (Biology), Lymphatic System, Hans Selye
4 Aug 2020
School
Department
Course
Professor
Document Summary
Abnormal functioning of the body associated with disease. Stressors disrupt homeostasis but they alert us that something is going to be happening if this stressor continues you will begin to adapt. Ex: when you start to learn a motor function, in physical training you need to first respect your aerobic capacity. Regular exercise 3x a week for 3 months will have changes in their heartrate. The word stress originally came from physics and selye adapted it. Conducted animal studies where harsh exposures of any sort produced the same patter of adverse physiology. Shrinking or atrophy of thymus, spleen, lymphatic structures. Alarm reaction increased heart rate, blood pressure, sweating increased epinephrine, norepinephrine, glucocorticoids increased energy resources mobilized increased blood flow to extremities and decreased to visceral organs. Homeostasis reestablished but at a different abnormal level of physiology the ability to react to stressors shifts- often becoming more reactive. Organism seems stabilized at new level, and to have adapted to stress.
