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

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

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

  • C - alveoli - thin walled vascular bag - like structure for exchange of gases

  • D - lower and of lungs -diaphragm pulls it down during inspiration

Answer

C.

C - alveoli - thin walled vascular bag - like structure for exchange of gases

C - Alveoli are thin - walled vascular bag -like structure for exchange of gases. A - trachea or windpipe is an air conducting tube through, which transport of gases takes place. B - pleural membrane is double layered, which reduces friction on the lung surface. D- diaphragm is involved in the inspiration and expiration process of breathing.

C - Alveoli are thin - walled vascular bag -like structure for exchange of gases. A - trachea or windpipe is an air conducting tube through, which transport of gases takes place. B - pleural membrane is double layered, which reduces friction on the lung surface. D- diaphragm is involved in the inspiration and expiration process of breathing.