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ireland3e_lecture_ch01 - Chapter 1 What is Life...

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8/18/2011 1 Chapter 1 What is Life? Characteristics of Life Respond to external stimuli Alter the environment Sense the environment Adapt to the environment
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8/18/2011 2 Characteristics of Life Use energy Reproduce Contain materials found only in living organisms Maintain homeostasis (a constant internal environment) Have a high degree of organization Living Organisms Have a High Degree of Organization Cells smallest unit of life, contained in a membrane or cell wall muscle cells Tissue a group of cells with a similar function muscle Organ structure composed of more than one tissue having one or more specific functions heart Organ systems a group of organs that perform a broad biological function cardiovascular system Organism one living individual Human
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8/18/2011 3 Hierarchy of Organization of Life Living Things Must Maintain Homeostasis Homeo = unchanging stasis = standing therefore , homeostasis means staying the same Humans function properly only within narrow ranges of temperature and chemistry
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