Tonsils
They trap bacteria and debris. They are a filter.
Crypts
Cilia.
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An organ of the lymphatic system, the spleen filters blood and destroys old blood cells by sending them to the liver and elsewhere. The spleen also removes foreign matter such as bacteria and produces lymphocytes, cells that are essential for immunity. In humans, the spleen also stores blood to meet additional demands. If part of the spleen is removed, the spleen can sometimes regenerate.
Tonsils
The human spleen is an organ. It creates lymphocytes for the destruction and recycling of old red-blood cells. It is also a blood reservoir. It also can supply the body with blood in emergencies like a bad cut. Also, it is the location where white blood cells trap organisms. The spleen is part of the lymphatic system, not digestive.
The function of the spleen is to act as a filter for blood, store of white blood cells and platelets, recycling of old red blood cells, and fighting bacteria that cause meningitis and pneumonia.
dust
The nasal cavity
They trap bacteria and debris. They are a filter.
Cilia.
Crypts
Your tonsils can trap bacteria from entering your system.
The spleen functions to filter out dead or damaged cells from the bloodstream. It also is a part of the immune system, as it stores white blood cells and is the primary site of antibody formation.