The complement system serves to:
a. increase blood flow to the area of infec-tion and can also effectively wall off the infection through the production of barrier substances.
b. attract and enhance the activities of pha-gocytes.
c. provide substances secreted by one type of cell, which have substantial effects on the antiinfective activities of other cells.
d. ingest and destroy microorganisms.
B
Because neutrophils and macrophages are widely dispersed throughout the body, the comple-ment system sends signals to attract and concentrate these cells at the point of invasion.
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