Immune System - Many cells, tissues and organs that work together to fight disease., Pathogen - Any microorganism that makes you sick. (Examples: virus, bacteria), White Blood Cells - Cells of the immune system that produce antibodies and help destroy pathogens., Antigens - A protein or receptor on the surface of a pathogen that the body recognizes as a foreign invader., Antibodies - proteins produced by white blood cells to fight pathogens., Vaccine - A weakened or dead version of a pathogen. It stimulates an immune response (antibodies!) to prepare for and prevent a disease., Antibiotics - Medicine/drugs used to fight a bacterial infection. Taking antibiotics when it is not necessary increases the risk of growing resistant bacteria (super bugs!), Immune Response - the reaction of the immune system when the body recognizes an invader or pathogen. White blood cells learn about the pathogen and try to produce antibodies to kill it., Disease - Is a failure or disruption of homeostasis - the body is sick, the body is unstable, Virus - a nonliving pathogen that only consists of genetic material. It needs to infect a host cell to reproduce., Bacteria - living microorganisms. Most are good, but a small number cause disease. They have cell walls but do not have a nucleus. , HIV - an autoimmune disease that attacks and kills the white blood cells of the immune system. Someone with this disease is vulnerable to become sick., Heal (healing process) - to fix, to get better, Unable  - Incapable - incapaz, Proteins - large macromolecules made of amino acids with different jobs to do. Some proteins are on the outside of pathogens and cells, acting as keys., Nucleus - the organelle in some cells that contains DNA , genetic material - genetic information in the form of DNA or RNA. The molecules that get passed onto offspring (babies) during reproduction., Mitochondria - the organelle in some cells that uses sugar to make ATP energy., Lack - not have, Allergy - result from an overreaction of the immune system to a harmless substance, Prevent (Deter) - To stop - detener , Immune - protected against a disease or medicine, Antibiotic Resistance - the bacteria who survive the antibiotic pass on their traits to reproduce more bacteria who are resistant., Trait - Characteristic , Offspring - the product of reproduction (baby/new cells), Reproduce - produce more of a species or cell, Hypothesis - A sentence that explains an idea. It always ends in a period (.) it is not a question., Experimental Question - Is a question to investigate - it always ends in a question mark (?), Strength (strengthen) - Strong, fuerte, Weak (weakness, weaken) - NOT strong, debil, debilitar,

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