A nurse is discussing the role of antibodies in the complement system with a group of nursing students. Which statement by a student is correct?
a. "Antibodies activate the complement cas-cade by turning on the alternative path-way."
b. "Antibodies that are free in solution can activate the complement system."
c. "Antibodies flag target cells to be lysed by membrane attack complexes."
d. "Antibody receptors are nonspecific to antigenic determinants."
C
Lysis of target cells that have been tagged with antibodies is the most dramatic effect of the complement system. Antibodies activate the complement cascade by turning on the classical pathway. C1 cannot bind with free antibodies. Antibody receptors are specific to antigen deter-minants.
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