Immune system cells (lymphocytes) react to each different kind of pathogen with a defense targeted specifically at that pathogen. Cells of immune system can distinguish between different kinds of pathogens. The immune response is controlled by the immune system, in particular, the lymphatic system, the body’s disease-fighting system. If a pathogen manages to penetrate the first line, and survive the second line, a third line of specific response is then triggered – the immune response. Symptoms = inflammation, redness, pain and fever. Inflammatory response is the body’s first reaction against infection or tissue damage. White blood cells called phagocytes then fight pathogens by engulfing them and breaking them down. Fluid and white blood cells leak from blood vessels into nearby tissues. When body cells are damaged, they release chemicals that trigger the inflammatory response. Includes skin, mucous membranes, cerumen, tears, sweat and saliva, hairs and cilia.
CHICKEN INVADERS 3 PART 1 SKIN
Non pathogenic bacteria (biological) on skin and in GI tract take up space and resources to prevent other harmful microorganisms from surviving. Surfaces of the skin (mechanical) physically prevent pathogens coming in, breathing passages, mouth, stomach (chemicals) – all mucous containing enzymes which trap and kill most pathogens the enzymes come in contact with. The body’s mechanical, chemical and biological barriers. Once introduced, adaptive system never forgets it. Can happen organically (touch a dirty door knob) or premeditated (vaccinations). Job= keep enemy from getting in.Īka specific defense or acquired immunity.ĭoes things differently to innate immunity: it has to be introduced to a specific pathogen and recognize it as a threat before it goes to action. Generalized, responds to all kinds of immunity the same way. When host damage reaches a certain threshold, it can manifest itself as a diseaseĪka non-specific immunity. Pathogens are defined as microbes capable of causing host damage. The immune system attacks organisms and substances that invade body systems and cause disease in 3 distinct stages. The immune system is the body’s defense against infectious organisms and other invaders.
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