Physical Components: The Immune & Lymphatic Systems Introduction

The immune system consists of:

• Bone marrow
• Specialized white blood cells
• Circulatory system
• Lymphatic circulation
• Lymph nodes
• Peyer’s patches (in small intestines)
• Spleen
• Tonsils

Although Unseen, It’s a Powerful Force

It is a fundamental property of immunity that no part of our body is cut off from its surveillance. For this reason, although the immune system may seem a less substantial thing than an organ such as the heart or the liver, in aggregate, immunity consumes enormous resources, producing the large number of cells that it depends on for successful functioning. – L.B. Nicholson, 2016