THE HUMAN IMMUNE SYSTEM
DEFENSE MECHANIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Barries within our body which form the immune system.
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When the pathogens gets through the external defenses, and the body’s response leads to healing
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The response from our body when a pathogen gets inside our body.
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Physical and chemical barriers which prevent disease-causing pathogens enter your body.
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An example of a first line defense are the immune cells.
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Detailed explanation-1: -The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils.
Detailed explanation-2: -The innate immune system is the body’s first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the “nonspecific” immune system.
Detailed explanation-3: -The primary barrier to the entrance of microorganisms into the body is the skin. Not only is the skin covered with a layer of dead, keratinized epithelium that is too dry for bacteria in which to grow, but as these cells are continuously sloughed off from the skin, they carry bacteria and other pathogens with them.
Detailed explanation-4: -Mechanical barriers-which include the skin, mucous membranes, and fluids such as tears and urine-physically block pathogens from entering the body. Chemical barriers-such as enzymes in sweat, saliva, and semen-kill pathogens on body surfaces.
Detailed explanation-5: -The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.