One Mechanism That Some Animals Use to Limit Heat Loss

question 9

Multiple Choice

One mechanism that some animals use to limit heat loss in cold environments is

• A)vasodilation of the near surface blood vessels.
• B)vasodilation of below surface blood vessels.
• C)vasoconstriction of the precapillary sphincters in the skin.
• D)vasoconstriction of veins.
• E)increasing cardiac output.

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Definitions:

Parietal Pericardium

The layer on top of the visceral pericardium.

Blood Pressure

The pressure of circulating blood against the walls of blood vessels, typically measured in the arteries.

Cardiac Output

The volume of blood the heart pumps per minute, a critical measure of heart function and cardiovascular health.

Vasodilation

The widening of blood vessels, which decreases blood pressure and increases the flow of blood.