Chapter 25 (1) - 25 PLANTSAND ANIMALS COMMON CHALLENGES...

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25 PLANTS AND ANIMALS—  COMMON  CHALLENGES Chapter Outline IMPACTS, ISSUES: A CAUTIONARY TALE 25.1 LEVELS OF STRUCTURAL  ORGANIZATION From Cells to Multicelled Organisms Growth versus Development Structural Organization Has a History The Body’s Internal Environment Start Thinking “Homeostasis” 25.2 RECURRING CHALLENGES TO  SURVIVAL Gas Exchange in Large Bodies Internal Transport in Large Bodies Maintaining the Water–Solute Balance Cell-to-Cell Communication On Variations in Resources and Threats 25.3 HOMEOSTASIS IN ANIMALS Negative Feedback Positive Feedback 25.4 DOES HOMEOSTASIS OCCUR IN  PLANTS? Walling Off Threats Sand, Wind, and the Yellow  Bush Lupine About Rhythmic Leaf Folding 25.5 HOW CELLS RECEIVE AND  RESPOND   TO SIGNALS SUMMARY SELF-QUIZ CRITICAL THINKING Objectives 1. Understand  the  many  levels  of structure  and  function,  and  tell  how  they  form  a division  of  labor. 2. Distinguish  between  growth  and  development. 3. How  does the body’s internal environment  help to maintain  homeostasis? 4. Tell the difference(s) between  short-term and  long-term adaptation. 5. How  is homeostasis maintained  in plants and  animals? 220 Chapter  Twenty-Five
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Key Terms active transport apoptosis circadian  rhythm compartmentalization development diffusion effectors extracellular fluid  (ECF) growth habitat homeostasis  internal environment integrator interstitial fluid negative feedback  mechanism organ organ system positive feedback  mechanism sensory receptors system  acquired   resistance tissue Lecture Outline Impacts, Issues: Too Hot to Handle A. All organisms function best within  a limited  range of internal operating  conditions. 1. The human  body operates best when  the internal temperature  is between  97 ° F and   100 ° F. 2. Above 105 ° F the body’s normal cooling mechanisms  fail; heat stroke, with its  devastating  denaturation  of enzymes, and  death  can occur. B. Anatomy  is the study  of an organism’s form; physiology is the study  of function. 25.1 Levels of Structural Organization A. From Cells to Multicelled Organisms 1. The integrated  parts of the body divide up  the tasks—a division of labor. 2. tissue  is a community  of cells specialized  for particular tasks. 3. An  organ  consists of two or more tissues working  together. 4. An  organ system  consists of different organs working  to accomplish a common  task. B. Growth  versus Development 1. Growth  (quantitative) is the increase in the number, size, and  volume  of the cells of a  multicelled organism. 2.
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Chapter 25 (1) - 25 PLANTSAND ANIMALS COMMON CHALLENGES...

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