Final answer:
Mechanical barriers, such as the skin and mucous membranes, guard against hazards by physically blocking pathogens from entering the body.
Step-by-step explanation:
Mechanical barriers are the type of controls that take the form of barriers to guard against a hazard.
Mechanical barriers physically block pathogens from entering the body. The skin, for example, is the most important mechanical barrier. The tough outer layer of the skin makes it difficult for pathogens to penetrate.
Other examples of mechanical barriers include the mucous membranes that line the respiratory, digestive, and reproductive tracts. These membranes trap and remove pathogens before they can cause harm.