BSC-2023_Ch1_2_Fall2011

BSC-2023_Ch1_2_Fall2011 - Click to edit Master subtitle...

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Unformatted text preview: Click to edit Master subtitle style 9/20/11 H uman Biology BSC 2023 U01 I nstr uctor : Steven Reinhardt Office: OE 215 Email: reinhard@fiu.edu Office H our s: Monday, Wednesday, Friday; 10:00AM - 12:00PM (Please make appointments in advance) Office phone: TBA M eeting Time / Place: Lecture: Monday, Wednesday, Friday; 1:00 PM 1:50 PM / Green-Library 100 Lear ning M ater ials : Text; Visualizing Human Biology, 3rd Edition, K.A. Ireland Syllabus: http://casgroup.fiu.edu/Biology/pages.php?id=3326 9/20/11 Chapter 1 What is Life? 9/20/11 Char acter istics of Life Respond to external stimuli Alter the environment Sense the environment Adapt to the environment Use energy Reproduce Contain materials found only in living organisms Maintain homeostasis (a constant internal environment) Have a high degree of organization (a system of increasing complexity = The Hierarchy Principle) 9/20/11 Living Things M ust M aintain H omeostasis Homeo = unchanging stasis = standing therefore , homeostasis means staying the same Maintenance of a relatively stable internal environment despite continuous outside changes Humans function properly only within narrow ranges of temperature and chemistry A dynamic state of equilibrium Homeostasis is controlled by both conscious and unconscious responses for example , humans maintain body warmth by unconscious blood vessel constriction and by consciously selecting appropriate clothing Generally speaking, if the body is functioning normally then the body is in homeostasis. This is more complicated than it appears, 9/20/11 Living Things M ust M aintain H omeostasis 9/20/11 Feedback Loop 9/20/11 Negative Feedback Loops Most homeostatic control mechanisms are these systems. In which, the output shuts off the original stimulus or reduces its intensity. These Mechanisms cause the variable to change in a direction opposite to that of the initial change, returning it to its ideal value. The example of; self-regulating body temperature is a good example of a Negative Feedback Loop. Positive Feedback Loops In these systems, the result or response enhances the original stimulus so that the activity (output) is accelerated. This feedback mechanism is positive because the change that occurs proceeds in the same 9/20/11 Or ganization of Living M atter H ier ar chical Pr inciple: ( hahy- uh- r ahr-ki-k uh l) is the classifying into successive layers the building blocks of life from the fundamental (atoms) to the complex organism. Chemical Level Cells Tissues Or gans Or gan Systems Or ganism ( A Natural organization based on a system of increasing complexity. Each level in the hierarchy is composed of groups of simpler units from the previous level, arranged to perform a specific function) 1. Chemical level: -Atoms; Are tiny particles that make up everything! They can be combined in various ways....
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This note was uploaded on 09/20/2011 for the course BSC 2023 taught by Professor Staff during the Fall '08 term at FIU.

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BSC-2023_Ch1_2_Fall2011 - Click to edit Master subtitle...

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