Which of the following is one of the categories of second-line defenses?ANSWERLeukocytesPhysical barriersChemical barriersMechanical barriers
Question
Which of the following is one of the categories of second-line defenses?ANSWERLeukocytesPhysical barriersChemical barriersMechanical barriers
Solution
Leukocytes are one of the categories of second-line defenses. The second line of defense is part of the immune system that includes cells and mechanisms that defend the host from infection by identifying and killing pathogens. This is also known as the innate immune system. Leukocytes, also known as white blood cells, play a major role in this defense system. They are responsible for identifying, attacking, and eliminating pathogens that have passed the first line of defense, which includes physical, chemical, and mechanical barriers.
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