The Median Age of the U.S. Population

question 151

Multiple Choice

The median age of the U.S. population

• A) was 37 in 1980.
• B) will be about 30 by 2010.
• C) is decreasing because the percentage of population in older age groups has decreased.
• D) is growing because the percentage of population in older age groups has increased.
• E) has not changed since 1980.

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Definitions:

Adducts

Muscles that move a limb or other body part toward the midline of the body.

Rotates

The action of moving around an axis or center point, typically described in the context of physical objects or movements in space.

Contraction

A shortening and tightening of a muscle or muscle group, which may occur as a natural part of physical activity or as a result of certain medical conditions.

MG

Could refer to myasthenia gravis, a chronic autoimmune neuromuscular disorder that causes weakness in the skeletal muscles.