The Change in Size of a Given Population of Organisms

question 9

Multiple Choice

The change in size of a given population of organisms may have a direct impact on humans.The 1993 outbreak of hantavirus in the southwestern United States was partly due to a(n)

• A) tightly linked cycle of human and hantavirus populations.
• B) increase in the deer mouse population size.
• C) decline in the desert salamander population, the normal hantavirus host.
• D) increase in human population size.

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Definitions:

Isotonic Saline

A solution of sodium chloride (salt) in water at a concentration that matches the salt concentration of the body cells and blood, commonly used for medical hydration and wound cleaning.

Extracellular Fluid

The body fluid outside cells, providing a medium for substances to pass between cells and blood vessels.

Resting Membrane Potential

The electrical charge difference across the cellular membrane when a neuron or muscle cell is at rest, typically around -70 mV.

Afterpotential

The electrical changes that occur in a neuron immediately following an action potential, which can affect the neuron's ability to fire again.