Fighting Disease. Pathogens. Pathogen is any disease causing microorganism, that cause a response from the body Bacteria cause disease by releasing toxins into the body Viruses cause disease by taking over and destroying cells . Immune-System Response.
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External Responses – First line of Defense
Vessels move around lymph, a white fluid containing white blood cells called lymphocytes
Nodes and the spleen filter out microorganisms, preventing them from entering the blood stream
Marrow makes white blood cells called macrophages
These cells are able to travel throughout the body to infection sites and destroy pathogens
outside of the pathogen, which