The Human Body Is Constantly Challenged by Pathogens in the Environment

question 16

Multiple Choice

The human body is constantly challenged by pathogens in the environment. It is not infected by every pathogen it encounters because the microbial flora

• A) engulf the pathogenic bacteria.
• B) produce conditions at the microenvironmental level that block colonization.
• C) prime our immune system.
• D) activate and support the action of antigen-presenting cells, cytokines, and cell-mediated immunity.

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Economic Inefficiency

A situation where resources are not allocated in the most effective way, resulting in waste or loss of potential benefit to society.

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