Just as the roof protects the interior of the house from both rain and sunshine so does the immune system of the body from harmful agents.
What is immunity?
Immunity is defined as the ability of the body to withstand and fight the invasion of a foreign agent.
This is can be achieved through the presence of immune cells and enzymes such as:
skin,
mucosal membrane,
phagocytes
immunoglobulin,
lysozyme
interferon and complement.
Therefore, the host is capable of forming resistance from foreign agents such as:
Toxins,
allergens,
microorganisms,
parasite and
cancer cells.
Learn more about immunity here:
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