What are other defenses the body has, in addition to its immune system, that help prevent infection and illness?A.Nerve signals and hormones, which regulate body functionsB.White blood cells and antibodies, which destroy pathogensC.The stomach, intestines, and liver, which digest bacteria and virusesD.Skin, tears, mucus, and saliva, which act as barriers to pathogens
Question
What are other defenses the body has, in addition to its immune system, that help prevent infection and illness?A.Nerve signals and hormones, which regulate body functionsB.White blood cells and antibodies, which destroy pathogensC.The stomach, intestines, and liver, which digest bacteria and virusesD.Skin, tears, mucus, and saliva, which act as barriers to pathogens
Solution
The body has several defenses in addition to the immune system that help prevent infection and illness. These include:
A. Nerve signals and hormones: These regulate body functions, including those that help protect the body from disease. For example, the nervous system can trigger a fever in response to an infection, which can help kill off pathogens.
B. White blood cells and antibodies: These are actually part of the immune system. White blood cells are responsible for identifying and destroying pathogens, while antibodies are proteins that the immune system produces to neutralize pathogens.
C. The stomach, intestines, and liver: These organs play a role in defense by digesting bacteria and viruses. The stomach produces acid that can kill many types of bacteria, and the liver filters blood to remove toxins.
D. Skin, tears, mucus, and saliva: These act as physical barriers to pathogens. The skin is the body's first line of defense, preventing many pathogens from entering the body. Tears, mucus, and saliva contain enzymes that can break down the cell walls of many bacteria, effectively killing them.
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