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.

---

Definitions:

All-or-none Principle

A principle stating that a neuron either fires at full amplitude or not at all, depending on whether the stimulus reaches the threshold level.

CNS

The central nervous system, consisting of the brain and spinal cord, responsible for processing and sending messages to and from the body.

Presbycusis

Age-related hearing loss, typically occurring in both ears, progressing gradually as a person ages.

-cusis

A suffix pertaining to hearing, used in medical terms related to hearing conditions.