© Copyright NewPath Learning. All Rights Reserved. 94-4953Visit www.newpathlearning.com for Online Learning Resources.Disease & the Body’s Defensesskin barrierinflammationinjuryPathogens & DiseaseA pathogen is an organism that can cause disease. Viruses, bacteria, fungi and parasites are examples of pathogens that can cause infection at a number of different locations in the body.Once a pathogen infects the body, our defense mechanisms work to destroy it. However, there is always the chance that a pathogen can spread from the initial site. It can multiply and invade surrounding tissues and the bloodstream, causing problems in many parts of the body. How Diseases SpreadPathogens can also be transmitted from one human to another through the air, via skin-to-skin contact, or on surfaces such as door handles. Body Defenses Against PathogensYou encounter a wide variety of pathogens every day, but your body is protected from them by different defense systems. A naturally existing barrier, such as your skin, is one type of defense against disease. is another general defense system that is activated when pathogens enter the body. mucusciliaNatural Barriers to DiseaseThe human body protects itself with systems that react naturally and automatically to invading organisms. Your skin, with its layers of protective tissue, is a very strong, watertight barrier to environmental pathogens. In your respiratory tract, mucus and cilia help trap pathogen particles and move them up to your throat, so you can cough and expel them.A third type of defense is the immune response, which is a very response to disease.B cellskin barrierinflammationinjuryA pathogen is an organism that can cause disease. Viruses, bacteria, fungi and parasites are examples of pathogens that can cause infection at a number of different locations in the body.Once a pathogen infects the body, our defense mechanisms work to destroy it. However, there is always the chance that a pathogen can spread from the initial site. It can multiply and invade surrounding tissues and the bloodstream, causing problems in many parts of the body. Pathogens can also be transmitted from one human to another through the air, via skin-to-skin contact, or on surfaces such as door handles. You encounter a wide variety of pathogeennnnnnnnnnnnnnssssssssssss eeeeeeeeeeeeevvvvveryyyyyyyyyyy dddddddddddddddaaaaaaaaaaaaayyyyyyyyyyyyyy, buttttttttt yyyyyyyyyyyyoooooooooooour bbbbboody is protected from them by different defense systttttttttttteeeeeeeeeeeeeemmmmmmmmmmmmmmmmsssssssss. 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