A 5-year-old male is diagnosed with a bacterial infection. Cultures of the bacteria revealed lipo-polysaccharides on the bacterial cell surface. Which of the complement pathways would be acti-vated in this case?
a. Classical pathway
b. Lectin pathway
c. Alternative pathway
d. Kinin pathway
ANS: C
The alternative pathway is activated by several substances found on the surface of infectious or-ganisms, such as those containing lipopolysaccharides. The classical pathway is primarily acti-vated by antibodies that are proteins of the acquired immune system. The lectin pathway is simi-lar to the classical pathway but is independent of antibody. It is activated by several plasma pro-teins. The kinin pathway is involved in coagulation.
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