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Question

The internal structure of lungs looks like an inverted tree. Such a structure helps to increase surface area for absorption.


A

True

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B

False

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Solution

The correct option is A

True


The branching of the trachea is similar to the branching of a tree. The trachea divides into 2 bronchi and into a number of bronchioles which end in a number of alveoli. This is done to ensure that there are many alveolus endings. This increases the surface area for gas exchange, just as a highly branched tree has more leaves than a poorly branched tree. The lung's internal structure is thus also highly branched.


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