Which one of the following has the smallest d | vedclass

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(D) The human respiratory system follows a branching pattern that decreases in diameter as it progresses deeper into the lungs.$1$. The $Trachea$ is t

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Respiratory bronchiole

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(D) The human respiratory system follows a branching pattern that decreases in diameter as it progresses deeper into the lungs.$1$. The $Trachea$ is the largest airway, which divides into the right and left primary bronchi.$2$. The $Primary 	ext{ } bronchi$ further divide into secondary and tertiary bronchi, and then into bronchioles.$3$. The $Respiratory 	ext{ } bronchiole$ is the final part of the conducting system before the alveolar ducts and alveoli, and it possesses the smallest diameter among the given options.Therefore, the correct answer is $D$.

Which one of the following has the smallest diameter?

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