Components of the Immune System
Illustration copyright 2000 by Nucleus Communications, Inc. All rights reserved. ://www.nucleusinc.com
The immune system is the body's natural defense system that helps fight infections. Theis made up of , , and other chemicals and proteins that attack and destroy substances such as bacteria and viruses that they recognize as foreign and different from the body's normal healthy tissues. The also includes:
- The tonsils and thymus, which make .
- The and vessels (the lymphatic system). This network of and vessels throughout the body carries lymph fluid, , and waste material between the body tissues and the bloodstream. The lymphatic system is an important part of the . The filter lymph fluid as it flows through them, trapping bacteria, viruses, and other foreign substances, which are then destroyed by special called .
- . This is soft tissue found mainly inside the long and legs, the , and the pelvic of the body. It is made up of red marrow, which produces red and and platelets, and yellow marrow, which contains fat and connective tissue and produces some .
- The spleen, which filters the blood by removing old or damaged blood cells and platelets and helps the by destroying bacteria and other foreign substances.
- . These blood cells are made in the and protect the body against infection. If an infection develops, attack and destroy the bacteria, , or other organism causing it.
Current as of:
June 26, 2018
E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine