Multiple Choice
Which of the following is a description of a behavior that helps warm the body?
38. Animal Form and Function
Thermoregulation
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On a cold day, blood vessels in the skin __________.
A
dilate, allowing blood to keep the skin warm
B
constrict, forcing blood to flow through vessels in the skin
C
dilate, causing blood to pass through the cold skin more quickly
D
dilate, preventing blood flow to the surface
E
constrict, reducing heat loss from blood at the surface
Verified step by step guidance1
Understand the physiological response of blood vessels to cold temperatures: When the body is exposed to cold, it aims to conserve heat.
Recognize the role of blood vessels in thermoregulation: Blood vessels can either dilate (widen) or constrict (narrow) to regulate heat loss.
Consider the effect of dilation: If blood vessels dilate, more blood flows to the skin's surface, increasing heat loss, which is not ideal in cold conditions.
Consider the effect of constriction: If blood vessels constrict, less blood flows to the skin's surface, reducing heat loss and conserving body heat.
Conclude that in cold conditions, blood vessels constrict to minimize heat loss, which aligns with the correct answer provided.
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