Hematocrit - basic principle

Lymphatic nodes and vessels Lymphatic vein - transport lymph Lymph node - filter lymph

Spleen Splenic vein - blood returning to the body after filtration Splenic artery - blood supply to the spleen for filtering Spleen - phagocytosis of damaged blood cells, storage of red and white blood cells, B and T cell immunity

Tonsils Nasal cavity Mouth Lingual tonsil at the base of the tongue Palatine tonsils on the lateral wall of fauces Adenoids/Pharyngeal tonsils in nasopharynx