LObj Chp 21 Flashcards
Identify components that comprise the lymphatic system
Lymph, lymphatic vessels, lymphatic tissues, Red bone marrow & Thymus
Lymph
(The recovered Interstital fluid that passed through lymphatic vessel) Clear colorless fluid with little protein that originate as ECF drawn into lymphatic capillaries.
Lymphatic vessels
Makeup of unified lymphatic capillaries(one ended closed) that return lost plasma proteins to blood stream
Lymphatic tissues
Makeup of lymphocytes and macrophages in the ct of mucous membranes(MALT Mucosa-Associated-lymphatic-Tissue and various organs.
Lymphatic Organs (Primary) (Red Bone Marrow, Thymus)
Site where stem cells T, and B divide and become IMMUNOCOMPETENT, and are able to recognize and respond to foreign antigens.
Lymphatic Organs(Secondary) Lymph nodes, tonsils, spleen, lymphatic nodules
Sites that deliver/execute/carry out immune responses
Major Functions of Lymphatic System
*Maintaining Homeostasis by
-draining excess interstital fluid
- lipid absorption and transport of dietary lipids
- providing defense against disease through immune responses
Anatomy of (Lymph Capillaries vs Blood Capillaries)
Lymph Capillaries: Blind ended, with overlapping endothelial cells creating mini-valves, often lacking a complete basement membrane, anchored to surrounding tissue by filaments.
Blood Capillaries: Continuous loop structure, with tight junctions between endothelial cells, usually with a complete basement membrane.
Lacteals
[Absorbs dietary fats]Specialized lymph capillaries present within small intestine villi that absorbs fats.
Formation and composition of lymph fluid
Leaking of interstitial fluid from capillaries into tissues which is then collected by lymphatic capillaries of lymphatic tissue.
Composition: water, proteins, electrolytes, WBCs, lymphocytes/ cellular debris from tissue.
Excessive fluid from blood plasma
Interstitial Fluid
Natural Killer Cell
Lymphatic cell that functions to non-specifically target bacteria, transplanted tissue cells, and virally infected or cancerous host cells.
Plasma cells
Originated as a B cell, eventually B cells differentiate into an antibody that produces plasma cells
Macrophages
Cells derived from monocytes that function as phagocytes and antigen-presenting cells are called macrophages
Lymph Circulation
1.Lymphatic capillaries absorb Interstitial fluid which turns to lymph
2. Lymph is drained by lymphatic capillaries into [collecting/lymphatic] vessels ………..