lymphatic system b11-5-03 explain the role of the lymphatic system in protecting the human body....
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Lymphatic System
B11-5-03 Explain the role of the lymphatic system in protecting the human body.
Include: lymph vessels, lymph nodes, and lymph
WARNING! WARNING! WARNING!
White blood cells are the same as …Lymphocytes, in which there are many types…Neutrophils, eosinophil's, basophils, monocytes which are perform…Phagocytosis!
Also B Lymphocytes = B Cells
• Key component of immune system• Like a secondary circulatory system– How does the circulatory system work?
• Functions to– Filter and destroy foreign substances– Filter and destroy cell debris – Produce lymphocytes
Organization
Lymph Vessels
• Begins with lymphatic capillaries– Take up excess fluid• Lymph
• Muscle contractions of vessels “squeeze” lymph along
• Prevented from flowing backward by one-way valves
Lymph
• Clear, colourless fluid collected as it filters through the capillaries of the blood
How does it work?
• Lymph passes from tiny capillaries to lymph vessels
• Flows through lymph nodes located along vessels
• Cells of the lymph nodes phagocytize (ingest) – Bacteria– Red blood cells– Cellular waste
How does it work? Cont…
• The lymph drains into either – Thoracic duct– Right lymphatic duct
• The lymph is then transported back into the veins of shoulder area
• Re-enters the general circulatory system
Where does it drain?
• Thoracic Duct– Below thorax– Left arm– Left side of head– Left side of neck
• Into the left subclavian vein
• Right Lymphatic Duct– Right arm– Right side of head– Right side of neck
• Into the right subclavian vein
Lymphatic Organs
Tissues of the Lymphatic System
• Contain large number of lymphocytes (WBC)– B-Cells– T-Cells
Red Bone Marrow
Red Bone Marrow
• Network of connective tissue fibres• Site of stem cells– Divide and produce lymphocytes
• B Lymphocytes mature
Thymus
Thymus
• Central organ control lymphocyte production and antibody formation
• Mature T lymphocytes from red bone marrow– Determines which T cells can detect antigens
Spleen
Spleen
• Filters the blood• Harbours lymphocytes that– Remove of and defective blood cells– Phagocytize foreign particles
Lymph Nodes
Lymph Nodes
• Small structures along lymphatic vessels, – cleanse lymph• Phagocytosis of foreign particles
Lymph Nodes
• During an Infection become enlarged with lymph, white blood cells, and can be felt
• Infections of the … can be felt …– Neck or head• In the neck
– Breast or arm• In the axillary region
– Pelvis or legs• In the inguinal region
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