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  4. Which organ is made up of air-carrying tubes and tiny sacs?

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Q. Which organ is made up of air-carrying tubes and tiny sacs?

Breathing and Exchange of Gases

Solution:

Air flows through the lung's complicated network of air-carrying tubes called bronchioles, which branch off the windpipe like the many branches on a tree trunk. Each branch ends in a tiny sacs (or pockets) called alveoli, where oxygen passes into the bloodstream. These increase the surface area for respiratory exchange of gases tremendously.