Use The arrow keys to move, get rid of all the bacteria, by touching them. Get rid of all the bacteria within 35 seconds. If not, you will lose. ~Questions and answers~ ♡What are the Foreign invaders?♡ Viruses or bacteria will enter the immune system and attempt to multiply rapidly to establish their presence in our bodies. They can cause infections and lead us to falling ill. ♢What are White Blood Cells?♢ White blood cells play an important role in our bodies, searching out invaders and battling viruses and bacteria that threaten our bodies. ♠How do White Blood Cells function?♠ When foreign invaders strike, white blood cells known as Basophils sound an alarm which alerts more white blood cells to come and ingest the invaders. Other cells such as Neutrophils rush to the site of infection to quickly get rid of the intruders. There are altogether 6 different types of White Blood Cells.