In What Year Was the West Nile Virus First Identified

question 7

Multiple Choice

In what year was the West Nile virus first identified as an emerging threat in the United States?

• A)1940
• B)1976
• C)1981
• D)1999

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Definitions:

Graded Potential

Graded Potential is a variable electric potential change in neurons that decreases in magnitude with distance from the stimulus source, contrary to the all-or-none response of action potentials.

Electrical Charge

A fundamental property of matter that causes it to experience a force when placed in an electromagnetic field.

Neuron

A cell in the nervous system that transmits information to other nerve cells, muscles, or gland cells.

Cell Body

The spherical part of a neuron that contains the nucleus and connects to the dendrites and the axon.