KP222 Lecture Notes - Lecture 1: Walter Bradford Cannon, Parasympathetic Nervous System, Sympathetic Nervous System
17 Jan 2018
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January 3rd, 2018: physiology is simplified through classification, cells, tissues, and systems interact, homeostasis is the central organizing principle of physiology. Homeostasis: written by walter cannon, movement of variables to fluctuate and confine the range in a way that is compatible with life, cannon took inspiration from claude bernard millieu interieur constant internal environment. Positive feedback loop: doesn"t cause variable to move back to set point, instead it pushes it farther away from set point, all have checkpoints to terminate movement of regulated variable away from set point. Pituitary gland -----(increase in lh) --- ovaries (when ovulation occurs, it effects lh levels to increase estrogen doesn"t allow any increase of estrogen levels) -------(release estrogen) ----- Signals of homeostatic system: hormonal (endocrine system next unit, autonomic nervous system (next week"s lab, parasympathetic nervous system, sympathetic nervous system. Intracellular fluid (2/3 of total body water is intracellular) **case of woman stuck under rubble in haiti**
