Immune system component that provides the primary protection against invasion by extracellular microbes is : antibodies.
The protective agents in humoral immunity that bind to an antigen when it enters the body are called antibodies.
Antibodies are proteins produced by the immune system in response to infection and also antibodies are important part of the defense system of the body as they work to destroy disease-causing organisms and block them from infecting human cells.
An antibody is also known as an immunoglobulin. It is a large, Y-shaped protein used by immune system to identify and neutralize foreign objects such as pathogenic bacteria and viruses. The antibody also recognizes an antigen.
To know more about antibodies, refer
https://brainly.com/question/15382995
#SPJ4
