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what is vaccination
its introducing small quantities of dead or inactive forms of pathogen into the body
what are antibodies and painkillers
painkillers relieve the symptoms like aspirin and paracetamol but antibodies treats the disease they directly kill baterica or stop the growth they dont work on viruses tho because they are made for bacteria
what does skin do In the human defence system
skin has physical barrier and oils so kills pathogens
what does nose do in the human defence system
they have lots of little hairs and mucus so traps pathogens
what does trachea do in the human defence
its covered in mucus and the stomach has hydrochloric acid so it kills pathogens that has been swallowed