The human body’s immune system

... Assignment: A2 Introduction In this assignment I am going to describe and discuss the human body's immune system, its structure, function and operation by analyzing each section below. We are all surrounded by bacteria, viruses, fungi and other organisms that are capable of invading our bodies and causing disease. We are able to overcome infections, because we have an immune system. This is a complex system involving many different cells and tissues that allow us to develop immunity resistance to infections. Common pathogens include bacteria, fungi, viruses and protoctists. This last group includes microscopic parasites such as Plasmodium, which causes malaria, and larger parasitic animals such as tapeworms. A pathogenic organism is able to: * Break through the physical barriers of the body and enter tissue or cells * Resist the efforts of the immune system to destroy it, long enough to multiply inside the host body * Transfer from one host and infect

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