The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.

  • Option 1)
     

    D - Lower end of lungs - diaphragm pulls it down during inspiration.

  • Option 2)

    A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air.

  • Option 3)

    B - pleural membrane - surround ribs on both sides to provide cushion against rubbing.

  • Option 4)

    C - Alveoli - thin walled vascular bag like structures for exchange of gases.

 

Answers (1)

 

Alveoli -

Alveoli are the primary sites of exchange of gases.

 

- wherein

Exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient.

 

 


Option 1)

 

D - Lower end of lungs - diaphragm pulls it down during inspiration.

Option is incorrect

Option 2)

A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air.

Option is incorrect

Option 3)

B - pleural membrane - surround ribs on both sides to provide cushion against rubbing.

Option is incorrect

Option 4)

C - Alveoli - thin walled vascular bag like structures for exchange of gases.

Option is correct

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