Stress, Illness and the Immune System
Stress, Illness and the Immune System By Saul McLeod updated 2010 The immune system is a collection of billions of cells that travel through the bloodstream. They move in and out of tissues and organs, defending the body against foreign bodies (antigens), such as bacteria, viruses and cancerous cells. There are two types of lymphocytes: B cells- produce antibodies which are released into the fluid surrounding the body’s cells to destroy the invading viruses and bacteria. T cells (see picture opposite) - if the invader gets inside a cell, these (T cells) lock on to the infected cell, multiply and destroy it. The main types of immune cells are white blood cells. There are two types of white blood cells – lymphocytes and phagocytes. When...