Warming a capillary bed to 42° C has which of the following effects? 1. It constricts the underlying blood vessels. 2. It increases blood flow well above tissue needs. 3. It "arterializes" the capillary blood
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: C
Warming the skin (to approximately 42° C) causes dilation of the underlying blood vessels, which increases capillary flow well above tissue needs. Blood gas values resemble those in the arterial circulation. This is why a sample obtained from a warmed capillary site is often referred to as arterialized blood.
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