Which system keeps us healthy and blocks germs from making us sick?

Which system keeps us healthy and blocks germs from making us sick?

• A. Immune System
• B. Circulatory System
• C. Digestive System
• D. Nervous System

Answer: (A)

Our body's defense against germs is the immune system. It recognizes invaders like bacteria and viruses, builds antibodies, and uses white blood cells to attack and remember germs so you stay healthy. It also includes barriers such as skin and mucus that block germs from entering in the first place. The other systems have important jobs—circulatory system moves blood, digestive system breaks down food, and nervous system controls actions and responses—but they don’t primarily block germs. So the immune system is the part that keeps us healthy and blocks germs from making us sick.

Our body's defense against germs is the immune system. It recognizes invaders like bacteria and viruses, builds antibodies, and uses white blood cells to attack and remember germs so you stay healthy. It also includes barriers such as skin and mucus that block germs from entering in the first place. The other systems have important jobs—circulatory system moves blood, digestive system breaks down food, and nervous system controls actions and responses—but they don’t primarily block germs. So the immune system is the part that keeps us healthy and blocks germs from making us sick.