Which of the following is/are good clinical example(s) of the principle of capillary action? 1. Capillary stick blood samples 2. Absorbent humidifier wicks 3. Certain surgical dressings
a. 1, 2, and 3
b. 1 and 2 only
c. 2 and 3 only
d. 2 only
ANS: A
Capillary action is the basis for blood samples obtained by use of a capillary tube. The absorbent wicks used in some gas humidifiers are also an application of this principle, as are certain types of surgical dressings.
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