Direction: This time you are going to listen to the text from Kidshealth.org, 2016. Use the link, kidshealth.org/en/parents/immune.html. For students who cannot access the link, ask somebody to read the given text below and answer the question.
Title: How Does the Immune System Work?

When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens. After they're made, antibodies usually stay in our bodies in case we have to fight the same germ again. That's why someone who gets sick with a disease, like chickenpox, usually won't get sick from it again. (Source: Hirsch, Larissa. "Immune System (for Parents)." Kidshealth.org. 2016, kid shealth.org/en/parents/immune.html.)

After listening attentively to the text, answer the question:

How does the Immune System work? ​