The Immune System

Have you ever been sick with the flu? If so, you may have exhibited symptoms such as fatigue, headache, aches, pains, discomfort in your chest, and/or a fever. A flu virus entered your body and your immune system did not have the correct antibody to prevent the virus from invading your system. After a few days of being sick, your body recovered and your immune system grew stronger. In this topic, you will explore how your immune system defends your body against pathogens, not only during flu season, but every second of every day.

Essential Questions

• How does the body defend itself against pathogens?
• What are the structures and functions of the immune system and the lymphatic system?
• What are vaccines and how do they develop the body's immunity to certain diseases?