Copyright 2009, John Wiley & Sons, Inc. Chapter 16 The Lymphatic System.
Immune System. Protection against Pathogens Diseases are caused by microorganisms. Microorganism – tiny living things, many one celled – Called Pathogens.
The Immune System and Disease Chapter 40. What is Disease? A disease is any change, other than injury, that disrupts the normal function of the body.
