Which respiratory structure likely has the largest surface area for gas exchange to occur?

Question

Quizplus · Accepted Answer

The alveoli of a pig have a very large surface area due to their numerous small sacs and their location in the lungs, which are highly branched structures. This means that there is a lot of surface area in a relatively small space, which allows for efficient gas exchange. The other options, such as the body surface of a worm or the tracheal system of a house fly, have much less surface area for gas exchange to occur. Although the gills of a trout are also specialized for gas exchange, they are not as efficient as the alveoli due to their location in the water, which provides less oxygen than air.

Which Respiratory Structure Likely Has the Largest Surface Area for Gas