Question

In order of activation (quickest to longest to be activated), which of the following describes the correct order for the three different complement pathways?

a. Classical > Lectin > Alternative
b. Alternative > Lectin > Classical
c. Classical > Alternative > Lectin
d. Alternative > Classical > Lectin
e. Lectin > Alternative > Classical

Answer 1

The correct order of activation for the three different complement pathways is: Classical > Alternative > Lectin.

Step-by-step explanation:

The correct order of activation for the three different complement pathways is: C. Classical > Alternative > Lectin.

The classical pathway is activated by the binding of antibodies to an antigen on a pathogen's surface. It is part of the adaptive immune response.

The alternative pathway is activated spontaneously and does not require antibodies. It involves the breakdown of C3 protein and the formation of the membrane-attack complex (MAC) to kill pathogens.

The lectin pathway is triggered by the binding of acute-phase proteins to pathogens, and it also leads to the activation of the complement system.