Lecture 12 Notes - Notes taken by Liz Homeostasis How I...

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2/16/07 Notes taken by Liz Homeostasis: How I Maintain A Stable Body OPEN THESE NOTES IN A WORD DOCUMENT – TO SEE FIGURE RELATING TO INSULIN & GLUCAGON Clicker Ques: Answer E- All of the above are true. Last Class Covered : / How your kidney “refreshes” the blood via filtration, re-absorption, secretion & excretion Today’s Class Covers : / Homeostasis – maintaining stable equilibrium in and around cells / Allostasis – maintaining metastable internal environment during stress (ppt) Are we water creatures? Why would anyone propose this? / 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 o Cell membranes are the site where all exchange of materials and wastes associated with the life of a cell occur o Cell membranes only function if moist / Leads to all the cool adaptations and development of specialized structures & systems (e.g. 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]. 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 interstitial fluids of tissues. Lymphatic vessels collect fluids, solutes, and foreign materials from tissue spaces (interstitial 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 1
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2/16/07 Notes taken by Liz (ppt) The above concept summary [“are we water creatures”] is depicted in the power
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