Preventing Communicable Diseases

Question 3 • *CR Foundations of Personal Wellness S2 [ELECTIVE, Y4904OX]

In order for a physical barrier to be effective in preventing infection, the barrier must __________.

Answer

prevent the substance from entering the body, trap the substance when it first enters the body, or flush the substance out of the body

destroy the substance before it enters the body, prevent the substance from reproducing, or flush the substance out of the body

trap the substance in the body, remove the substance from the body, or prevent the substance from reproducing

flush the substance from the body, transport the substance in the body, or destroy the substance in the body

Explanation

Physical barriers help stop pathogens from causing infection by keeping them out, trapping them at the body's surface, or flushing them away. For example, skin blocks entry, mucus traps pathogens, and tears can wash them away. Choice A describes these protective actions; preventing reproduction is not the defining function of a physical barrier.

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