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Why does the exchange of gases happen on...

Why does the exchange of gases happen only in alveoli, though arteries are present in pharynx, trachea and bronchus?

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Alveoli have several adaptations to maximize the efficiency of gas exchange. They fold to provide a wider surface area for gas exchange to take place and they are ventilated to remove carbon dioxide and to replenish oxygen levels in the alveolar air . This maintains maximum concentration gradient which refers to the difference in the concentration of a chemical across a membrane, between the air in the alveoli and blood. The alveoli have thin walls that are one cell thick to make the exchange surface extremely thin.
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VGS PUBLICATION-BRILLIANT-RESPIRATION - THE ENERGY PRODUCING SYSTEM -CREATIVE QUESTIONS FOR NEW MODEL PAPER ( 4 MARK QUESTIONS)
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  2. What do you know about the organelle that performs the cellular respir...

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  3. Why does the exchange of gases happen only in alveoli, though arteries...

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  4. Describe how oxygen enters the blood in lungs with the help of a block...

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  5. How does gaseous exchange occur in lungs ?

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  6. What is the role of diaphragm and ribs in respiration ? Are both activ...

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  7. Is respiration possible without diaphragm and ribs in human? Explain.

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  8. Identify the mismatched pair. 1) WBC to Oxygen transportation 2) ...

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  9. What are different ways in which glucose is oxidised to provide energy...

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  10. Write the adaptations seen in plants living in water logged conditions...

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  11. Write a brief note on respiration in plants.

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  12. How do you appreciate the mechanism of respiration in our body ?

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  13. Write a brief note on tracheal respiration in insects .

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  14. Explain the evolutionary changes in energy releasing system.

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  15. Describe the structure of human lungs with the help of a diagram

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  16. To observe Anaerobic respiration a student conducted experiment with y...

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  17. To observe Anaerobic respiration a student conducted experiment with y...

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  18. To observe Anaerobic respiration a student conducted experiment with y...

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  19. To observe Anaerobic respiration a student conducted experiment with y...

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  20. What is the pathway of air from nostril to alveolus ?

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