Kaplan Nursing Entrance Practice Exam

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Which of the following is considered a passive immune defense?

Vaccinations
Antibodies produced by the body
Skin and mucous membranes
Probiotics

The correct answer is: Skin and mucous membranes

Passive immune defense refers to the mechanisms that offer immunity without requiring the body to actively generate an immune response or produce antibodies. The skin and mucous membranes serve as the first line of defense in the immune system, forming a physical barrier against pathogens, thereby preventing them from entering the body and causing infection. This barrier does not involve the immune response and does not change over time, making it a form of passive protection. It is important for maintaining health and preventing the entry of harmful microorganisms. Active immune defenses, like vaccinations or antibodies produced by the body, involve the immune system’s response and the creation of specific defenses against infections. Probiotics can support gut health and enhance immune function but are not considered a direct passive immune defense in the way that skin and mucous membranes are.