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Scott Campbell The Specific Immune System The immune system has evolved a complex network of checks and balances that can be categorised as innate and learned immunity. Everyone is born with innate (natural) immunity. The components of the immune system involved in natural immunity are macrophages, neutrophils (a large white blood cell (leukocyte) that ingests antigens and other substances), and complement (a group of proteins that helps to attack antigens). (React similarly to all foreign substances, and the recognition of antigens does not vary from person to person). As its name indicates, learned immunity is acquired. At birth, a person's immune system hasn't encountered the outside world or started to develop its memory files. The immune system learns to respond to every new antigen encountered. Learned immunity is, therefore, specific to the antigens encountered during a person's lifetime. The immune system (See Biological Science book pages 534-535) carries a record/memory of...

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