Today's mini been is here! Overview of the Innate and Acquired arms of the Immune System In this video, Dr. Mobeen Syed gives an overview of the immune system. There are two arms of the immune system, the innate and acquired arm. The innate arm has a mechanical barrier available, through which pathogen has to move. If pathogen enters the body successfully, then within the innate arm, some cells arrest the pathogen. These cells digest the pathogen and present antigen outside their surface. Macrop