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Lymph nodes

Act as filters in the lymphatic system, they contain macrophages and phagocytes to destroy pathogens.

Lymphatic System

Protects the body by removing pathogens from lymphatic stream and “policing” other body fluids.

Lymphatic system contains:

Lymphatic vessels, nodes, tissues, and organs

Thymus 

Where T cells (help produce blood) differentiate 

Bone marrow

Location of stem cells that give rise to immune system, where B cells differentiate.

Tonsils

Function similar to nodes - fight infection, contain white blood cell which helps kill germs.

Spleen (curves around left side of stomach)

Red pulp - filters blood for old, damaged, or infected red blood cells

White pulp - producing and filtering immune cells

Immune response characteristics

1. Memory 

2. Specificity

3. Differentiation of self and non self 

Innate immune response 

Initial and immediate, macrophages and phagocytes that you are born with by simply reconnecting non self. Causes initial inflammation.

Acquired immune response 

Memory and specificity. Lymphocytes (b and T cells ) create antibodies to specific pathogens antigens that they encounter in the body.