Question

In which part of lungs gaseous exchange takes place in rabbit?

• A. Trachea and alveolar duct
• B. Trachea and bronchi
• C. Alveolar duct and alveoli
• D. Alveoli and Trachea

Answer 1

The correct option is C Alveolar duct and alveoli

In higher vertebrates like mammals (example rabbit, humans etc.), trachea is a straight tube, which divides into a right and left primary bronchi. Each bronchi undergoes repeated divisions to form the secondary and tertiary bronchi and bronchioles ending up in very thin terminal bronchioles. The tracheae, primary, secondary and tertiary bronchi and initial bronchioles are supported by incomplete cartilaginous rings. Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag-like structures called as alveoli. Alveoli and alveolar ducts or terminal bronchioles are the primary sites of exchange of gases.

Hence the correct option is C.