BIO SCI 47 Study Guide - Midterm Guide: Otto Loewi, Vagus Nerve, Pituitary Gland
22 Apr 2018
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Acute stressors are short term and they happen once. Chronic stressors are long term and recurring. Lungs open up and take in more oxygen. These all direct blood where it needs to go. Physiological processes that are stopped during stress response. These are all not necessary to keeping you alive so they stop. Homeostasis is optimal physiological balance within the body. Hans selye injected rats with saline and ovarian extract to see the result but both rats got sick bc he sucked at injecting them and they got stressed. Otto loewi had two frog hearts in saline. He electrified one and scooped the saline from that heart and put it on the other heart and the other heart sped up. Neurotransmitters work fast, short distances, and are direct. Sympathetic preganglionic is ach and postganglionic is norepinephrine. Parasympathetic preganglionic is ach and postganglionic is ach. Pituitary gland is control center, attached to hypothalamus.
