When the Temperature of the Outside Air Exceeds Their Internal

question 57

Multiple Choice

When the temperature of the outside air exceeds their internal body temperature, jackrabbits living in hot, arid lands will

• A) dilate the blood vessels in their large ears to transfer more body heat to the environment.
• B) constrict the blood vessels in their large ears to reduce transfer of external heat to the blood in their ears.
• C) increase motor movements to find a sunny area to maximize heat transfer into their bodies.
• D) increase pigmentation in their ears, darkening them to maximize their capacity to take up heat.
• E) begin involuntary shivering of their skeletal muscles in order to generate more metabolic heat.

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