In Industrialized Countries,the Number of Individuals 100 Years and Older

question 50

Multiple Choice

In industrialized countries,the number of individuals 100 years and older is increasing at the rate of approximately _____ percent each year.

• A) 3
• B) 5
• C) 7
• D) 9

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Definitions:

White Matter

Brain tissue composed of myelinated nerve fibers that connect different areas of the brain, facilitating communication among neurons.

Synapses

Structures that permit a neuron (nerve cell) to pass an electrical or chemical signal to another neuron, essential for the transmission of nerve impulses.

Neurotransmitter

A chemical secreted by a neuron sending a message that carries the impulse across the synaptic gap to the receiving cell.

Impulse

A sudden, involuntary urge to perform an act.