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(D) The respiratory system consists of a branching network of tubes. The trachea divides into primary bronchi,which further branch into secondary and

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Bronchioles

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(D) The respiratory system consists of a branching network of tubes. The trachea divides into primary bronchi,which further branch into secondary and tertiary bronchi,and finally into smaller bronchioles. The bronchioles are the narrowest and most numerous tubes within the lungs,which eventually lead to the alveolar sacs. Therefore,the correct option is $D$.

The narrowest and most numerous tubes of the lungs are termed as:

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