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Lecture 78

Lecture 78. Mr. Sover 13 April 2010. Collect Homework. Hand in lab reports Check study guides at the end of class. Exams to be handed back at the end of class. Period 3 avg = 92.5% (Five 60 or betters) Period 8 avg = 86% (Zero 60 or betters) It’s not too late to take charge. Group Work.

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Lecture 78

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  1. Lecture 78 Mr. Sover 13 April 2010

  2. Collect Homework • Hand in lab reports • Check study guides at the end of class

  3. Exams to be handed back at the end of class • Period 3 avg = 92.5% (Five 60 or betters) • Period 8 avg = 86% (Zero 60 or betters) • It’s not too late to take charge

  4. Group Work • P. 636 (1-5) • Work with each other

  5. Chapter 22 – Gas Exchange and Excretion

  6. Gas Exchange • Flow between oxygen and carbon dioxide • Cellular respiration • Cells need to be close to a damp environment • Small organisms vs. large organisms • Large organisms have evolved structures to shield gas exchange areas

  7. But what about plants? • Gas exchange occurs at many different places on the plant. • Cellular respiration occurs alongside photosynthesis • Gas exchange • Roots • Stems • Leaves (stomata)

  8. Animals? • Transport system • Animal’s location

  9. Segmented Worm Respiration • Moist habitat • Mucus -> blood

  10. Bony Fish • Exchange area is located close to water, however is not spread over the entire body • Gills • Water enters the mouth • Water passes over the gills (lamellae) • Capillaries inside (large SA)

  11. Respiration in Insects • Dry air drawn inside insects to what? • Spiracles • Tracheae -> tracheoles (large number of these)

  12. Blood (hemolymph does not transport gases). It is responsible for transport of nurtients and waste materials.

  13. Homework • Finish reading chapter 22 (p. 623-632 : 1-4)

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