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1. Which one of the following elements is considered as part of the first line of defense against microorganisms invading a body? A. Vaccine B. Saliva C. Antibodies D. White blood cells
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1. Which one of the following elements is considered as part of the first line of defense against microorganisms invading a body?

A. Vaccine
B. Saliva
C. Antibodies
D. White blood cells

User Riedsio
by
3.1k points

2 Answers

9 votes
C.White blood cells

The immune system comprises three levels of defense mechanism that a pathogen needs to cross to develop infection inside the body.
User Newtonx
by
3.7k points
14 votes
White blood cells would be your answer
User Ronin
by
4.0k points
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