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Feb19Lec - Feb 19th Transcribed notes Homeostasis How I...

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Feb 19 th Transcribed notes 1 Homeostasis: How I Maintain A Stable Body Clicker Ques: Answer given during lecture. Last Class Covered : How your kidney “refreshes” the blood via filtration, re-absorption, secretion & excretion How the kidney increases the number of RBC’s by producing erthropoiten Today’s Class Covers : Homeostasis – maintaining stable equlibrium in and around cells Allostasis – (means other state) maintaining metastable internal environment during stress (ppt) Are we water creatures? Why would anyone propose this? [Recall in BioG 109 Harry proposed we are fish]. NOTE: each of our cells is surrounded by water. Think about the lecture on the “organic soup” and the origin of life AND, that cells are the smallest entity with all the characteristics of life Cell membranes are the site where all exchange of materials and wastes associated with the life of a cell occur Cell membranes only function if moist Leads to all the cool adaptations and development of specialized structures & systems (eg. Circulatory & lymphatic systems) needed to allow cellular functions to occur within large organisms. The challenges of an aquatic life style will differ from those of a terrestrial life style [e.g why we don’t have gills].
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Feb 19 th Transcribed notes 2 A few facts about your Lymphatic System: Lymphatic System - A system consisting of lymph vessels and lymph nodes – that interfaces with your blood circulation and interstial fluids of tissues. Lymphatic vessels collect fluids, solutes, and foreign materials from tissue spaces (interstial fluids) and return it to the blood; muscle action moves the lymphatic fluid through the vessels. Most lymph filter through the lymph nodes that contain lymphocytes; these aid in immune response (nodes become swollen when inflamed – more on the immune system later in the course). Roles of the Lymphatic system include: 1. maintain fluid and ion (electrolyte) balance in body 2. transport certain fatty acids from villi to blood 3. assist in immune response 4. provide a route where interstitial fluid can return to the circulatory system (ppt SERIES) The concept summary of why “we are we water creatures” is depicted in the power point series illustrating the “Internal Milieu” and the diffusion of molecules into and out of cells.
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