The immune System

Our body’s defense system is a complex network of organs containing cells that recognize infections and diseases in the body and destroy them. When functioning properly, the immune system can distinguish between healthy tissue and critical viruses and bacteria. This system contains the thymus, white blood cells, antibodies, epidermis, cilia, mucus, and saliva. The thymus is a small organ where the white blood cells mature. THe white blood cells divide into two groups. On which creates antibodies that attack bacteria and the other which helps destroy infected or cancerous cells. An example of how our cells and tissues work together is when the layers of skin such as the epidermis protect our body from disease-causing viruses. Lastly, the cilia, mucus, and saliva trap dust and other bacteria that may enter the nasal cavities or mouth. To remove the bacteria they sneeze or cough. Together all of these parts of the immune system work together to create immune responses.

There are three types of line of defense. Line of defenses are the abilities to defend and protect the body against i...