كيف تعمل المناعة في الجسم؟ (رسوم متحركة بسيطة)

The immune system's first line of defense consists of natural barriers that prevent microbes from entering the body.Let's explore these barriers one by one.The skin forms a protective shield that blocks microbes from entering the body.Mucus in the nose and mouth traps bacteria and viruses, preventing them from going deeper into the body.Sweat and tears contain special enzymes that can kill bacteria on contact.Finally, strong acids in the stomach destroy most microbes that enter with food.When pathogens breach the body's first line of defense, white blood cells spring into action.These specialized cells patrol the bloodstream, constantly searching for invading microbes.When a white blood cell encounters a pathogen, it engulfs and destroys it through a process called phagocytosis.Some white blood cells produce specialized proteins called antibodies that target specific types of pathogens.These antibodies attach to the pathogens, marking them for destruction by other immune cells.There are several types of white blood cells, each with specialized functions in defending the body.These different types of white blood cells work together, coordinating their responses to effectively fight off infections.When a pathogen first enters the body, the immune response takes several days to develop.B cells take time to recognize the threat and begin producing antibodies.As antibodies are produced, they begin attacking the pathogen.During this process, memory cells are created and stored for future protection.When the same pathogen enters the body again, the response is much faster.Memory cells quickly recognize the threat and immediately begin producing antibodies.This is the principle behind vaccination. Let's see how vaccines work to protect us.