Human respiratory system

2013 NEET 1 question

1. 1 Breathing and Exchange of Gases
   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:
   
   A D – Lower end of lungs – diaphragm pulls it down during inspiration B A – trachea – long tube supported by complete cartilaginous rings for conducting inspired air C B – pleural membrane – surround ribs on both sides to provide cushion against rubbing D C – Alveoli – thin walled vascular bag like structures for exchange of gases
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