lymphatic

• What are the key structures of lymphatic system?

  Lymph nodes, lymphatic vessels, spleen, thymus, tonsils
• What system does the lymphatic system work closely with?

  Circulatory system
• What system is the lymphatic system considered to be a part of?

  Immune system
• What direction does lymph flow?

  Unidirectional
• What do lymphatic capillaries return to the blood from the body?

  Fluid
• What is the function of lacteals in the small intestine?

  Absorb and transport lipids and fats
• What are the primary lymphoid organs?

  Bone marrow, thymus
• What are the secondary lymphoid organs?

  Lymph nodes, spleen, tonsils
• What do lymph vessels do?

  Collect and transport lymph back to veins
• Where does lymph originate from?

  Interstitial fluid
• What do lymph nodes do?

  Filter out harmful substances and waste products in lymph
• What is interstitial fluid?

  Fluid between individual cells in tissues
• How many liters of plasma is reabsorbed by the blood vessels?

  17 liters
• How many liters is picked up by the lymphatic system that the blood vessels don't pick up?

  3 liters
• What are the names of the 2 major lymphatic channels?

  Thoracic duct, right lymphatic duct
• What are afferent lymph vessels?

  Vessels that bring unfiltered lymph from the body to lymph nodes to be filtered
• What are efferent lymph vessels?

  Vessels that carry filtered lymph from lymph nodes back to the bloodstream
• What does the spleen do?

  Filters blood, removes old erythrocytes, platelets, and pathogens, stores white blood cells
• Does the spleen contain afferent or efferent lymph vessels?

  Efferent
• What cells make up lymphatic capillaries?

  Endothelial cells
• What does MALT stand for?

  Mucosa-Associated Lymphoid Tissue
• Where are the largest collections of MALTs in the body?

  Tonsils, Peyer's patches, appendix
• True or False: Fats can be absorbed into the bloodstream directly

  False
• Why can't fats directly be absorbed into the bloodstream?

  They're too large
• What is antigen sampling?

  MALTs sample antigens from the intestinal lumen and present them to immune cells for recognition and activation
• What does the lymphatic system have to do with chylomicrons?

  Lacteals within the lymphatic system absorb the chylomicrons and lymphatic vessels transport the lacteals containing chylomicrons to the bloodstream
• B cells mature in the bone marrow but they also mature in the ___

  Spleen
• In what part of the spleen does B cells mature in?

  White pulp
• Where do T cells originate from?

  Hematopoietic stem cells (HSCs) in bone marrow
• Where are T cells formed initially?

  Bone marrow
• What does the cisterna chyli do?

  Receives lymph from the left and right lumbar trunks, intestinal trunk, and some lower intercostal vessels