Science Quiz: On the immune system

How does your body protect itself? How does the immune system fight threats? And how much do you know about this process? Take this quiz and find out.

Science Quiz: On the immune system

1 / 6 |
A number of organs and cells make up your body’s immune system. What are the small, bean-shaped structures that act as filters, trapping viruses, bacteria and other harmful substances, found throughout your body?