Lymphatic and Immune System Quiz Flashcards
Functions of Lymphatic System
Immunity
Lipid absorption
Fluid recovery
Organs Involved in Lymphatic System
Red bone marrow Thymus Tonsils Spleen Lymph nodes
Lymph
Clear, colorless fluid, similar to plasma but much less protein
Lymphatic Capillaries
Closed at one end
Tethered to surrounding tissue by protein filaments
Endothelial cells loosely overlapped
Lymphatic Vessels
Larger ones composed on tunica interna, tunica media, and tunica externa
Route of Lymph Flow
Lymphatic Capillaries
Collecting Vessels
Lymphatic Trunks
Collecting Ducts (Right Lymphatic and Thoracic)
Mechanisms of Lymph Flow
Low pressure and low speed
Aided by pumps
Moved along by rhythmic contractions of lymphatic vessels
Lymphatic Cells (Lymphocytes)
Natural Killer Cells
T Lymphocytes
B Lymphocytes
Antigen Presenting Cells
Lymphatic Tissue
Aggregations of lymphocytes in mucus membranes and CT of many organs
Lymph Nodes
Bean-shaped organs located around lymphatic vessels
Cortex and medulla
Flow is in one direction
Filter lymph
Palatine Tonsils
Pair at the posterior margin of the oral cavity
Lingual Tonsils
Pair at the root of the tongue
Pharyngeal Tonsil
Single tonsil on the wall of the pharynx (adenoid)
Thymus Gland
Two lobed organ in the mediastinum
Spleen
Red pulp filled with erythrocytes
While pulp filled with lymphocytes and macrophages
Blood reservoir and filters blood
2nd Line of Defense
Neutrophils, Eosinophils, Basophils, Macrophages
Neutrophils
Phagocytize bacteria
Create a killing zone
Kills itself