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GASEOUS EXCHANGE

GASEOUS EXCHANGE. Respiratory surface Respiratory System in Human Control of breathing Gaseous exchange in Insect Gaseous exchange in Fish Gaseous exchange in Plant. Respiratory surface. Small organisms surface volume ratio is large Larger organism surface volume ratio is small.

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GASEOUS EXCHANGE

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  1. GASEOUS EXCHANGE Respiratory surface Respiratory System in Human Control of breathing Gaseous exchange in Insect Gaseous exchange in Fish Gaseous exchange in Plant

  2. Respiratory surface Small organisms surface volume ratio is large Larger organism surface volume ratio is small

  3. Characteristics of respiratory surface Large surface area Moistened surface Thin and freely permeable to gases With transport system

  4. Types 1 2 4 3 6 5

  5. Human Respiratory System

  6. Lung tissue

  7. Mechanism of Breathing Animation Photo

  8. Treatment to inhaled air Warmed by capillary in nostrils Moistened by mucus Cleaned and filtered by hair, cilia and mucus

  9. Lung capacities Volume of air

  10. Control of Breathing Respiratory centre Chemoreceptor pCO2

  11. chemoreceptor 1. Peripheral chemoreceptor Detect both Po2 and PCO2 Carotid bodies, aortic bodies 2. Central chemoreceptors Detect PCO2 Medulla Effect of PCO2 is larger than Po2

  12. Respiratory centre In medulla oblongata Receive impulse from chemoreceptor Send impulse to diaphragm and intercostal muscle Change rate and depth of breathing

  13. Effect to lung pO2 decrease and pCO2 increase rate and depth of breathing increase pO2 increase and pCO2 decrease Rate and depth of breathing decrease

  14. Other effect pCO2 increase Heart : rate increase Blood vessel: vasodilation Increase rate and volume of CO2 transport

  15. Detected by chemorecetor Impulse to respiratory centre Impulse to intercostal and diaphragm muscle by efferent nerve Rate and depth of breathing increase pCO2 back to normal Feedback Partial pressure of CO2 pCO2 increase

  16. Gaseous Exchange in insects Mechanism Abdomen movement, fluid movement

  17. Trachea

  18. Spiracle

  19. During rest more fluid During exercise less fluid During exercise

  20. Breathing in fish

  21. Gill

  22. Gill photo

  23. Where is gaseous exchange taking place? Buccal surface Gill in tapole Skin

  24. Bird

  25. Gaseous Exchange in Plant No special organ for breathing but some special features in various organs for increasing surface area Leave Stem Root

  26. Leave

  27. Root Hair

  28. Lenticel

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