What Functions Do the Alveoli Serve in the Lungs

question 59

Multiple Choice

What functions do the alveoli serve in the lungs?

• A) They ensure that air flows completely through the lungs.
• B) They prevent dust and pollen from entering the lungs.
• C) They help to expand and contract the lungs.
• D) They allow for the exchange of carbon dioxide and oxygen.

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Definitions:

Sedimentary Layers

Strata or layers of rock that have been formed from sediment deposition over vast periods of time.

Block Diagram

A diagram that portrays in three dimensions the shape of the land surface and the subsurface distributions of rock units, folds, faults, and other geologic features.

Erosion

The process by which soil, rock, and other surface material are worn away and transported by natural forces such as wind or water.

Deposition

the geological process by which sediments, soil, and rocks are added to a landform or land mass.