Practice Questions
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Which of the following statements best describes the role of skin in pathogen defense?
Skin releases sebum, a natural oily film. Other options are incorrect because The idea that skin is only a physical wall ignores its chemical action; ...
Order the following barriers to pathogens in terms of their functioning in the body's defense system: A. Skin oils create an acidic environment B. Mucus traps pathogens C. Skin serves as a physical barrier D. Sebum kills pathogens
First the skin blocks microbes. Other options are incorrect because This option puts acids and sebum before the skin barrier; This option keeps skin f...
Which of the following substances serves as a physical and chemical barrier against pathogens, and why is it effective in preventing infections?
Sebum is an oily film produced by sebaceous glands on the skin. Other options are incorrect because Many think mucus can kill germs, but it mainly tra...
Skin barriers in the body are to pathogens as A: mucous membranes are to ?
Mucous membranes line the nose and throat. Other options are incorrect because Some think food particles need the same kind of barrier; Sunlight is no...
What underlying mechanism explains why skin oils can effectively prevent pathogen entry into the body?
Skin oils spread over the skin surface and form a thin film. Other options are incorrect because People think the oils have special enzymes to eat ger...
Which barrier primarily provides a chemical defense against pathogens on the skin?
The oil that comes from skin glands carries fatty acids that stop germs from growing. Other options are incorrect because Mucus traps germs, but it li...
After playing outside, Mia notices that her hands feel greasy and she has some dirt under her nails. She remembers her health teacher discussing the body's natural defenses against germs. How does the greasy substance on her skin help protect her from pathogens?
The oily skin secret, sebum, is slightly acidic. Other options are incorrect because Some people think oil keeps germs from sticking because it is sli...
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