BIO172W08Lec29CT - Biology 172 Lecture 29 -...

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Lecture 29 - Water/Electrolytes: Animals March 26, 2008 Today’s Outline 1.Organization of animal cells/tissues - Connective, nervous, muscle, epithelial 2.Homeostasis 3.Water/Electrolyte Balance - Kidney structure - Filtration & Reabsorption - Osmotic gradient: Loop of Henle - Regulation Biology 172 Announcements 1. Revised reading for lecture -- Ch. 41: pp.937- 941 ; Ch.42: pp.955-958, 960-961, 965-973 1. Discussion this week: Countercurrent Exchangers (Revised supplemental reading)
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Organizational Principles 1. Hierarchy of structure/function: cells, tissues, organs, organ systems 2. Adaptations to environmental conditions: traits in a species are derived by natural selection from preexisting traits (biology does not create a perfectly engineered solution) 3. Acclimatization: short-term, reversible changes in response to environmental fluctuations 4. Homeostasis: maintaining relatively constant chemical and physical conditions in the body
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Four Major Tissue Types 1. Connective tissue – relatively loosely arranged in extracellular matrix; structural support 2. Nervous tissue – nerve cells and glial cells; communication through electrochemical signals 3. Muscle tissue – striated (skeletal), cardiac (heart), smooth (blood vessels, digestive tract) 4. Epithelial tissue – covers outside of body, lines surfaces of organs, forms glands
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Epithelial Cells: Closely Packed and Polarized connective connective tissue tissue epithelium epithelium Apical surface of many epithelia faces the
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BIO172W08Lec29CT - Biology 172 Lecture 29 -...

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