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B
Atrium
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C
Bronchioles
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D
Alveoli
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Solution
The correct option is A Bronchi Human respiratory system consists of larynx, trachea, bronchi, bronchioles, alveoli, lungs. The larynx is the first part of respiratory system. It leads into a long tube called trachea. Trachea contains incomplete rings of hyaline cartilage. This prevents the collapse during respiration. Trachea divides into two bronchi, left and right. These bronchi enter the left and right lungs respectively. Bronchi is further divided into bronchioles. Alveoli are present at the end of bronchioles.