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Lymphatic Structures and Functions

Lymphatic Structures and Functions. Functions. Functions: LYMPH – fluid that goes between capillary blood and tissues. LYMPH VESSELS – transport excess tissue fluid back into circulatory system. LYMPH NODES – produce lymphocytes, filter out harmful bacteria.

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Lymphatic Structures and Functions

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  1. Lymphatic Structures and Functions

  2. Functions Functions: • LYMPH – fluid that goes between capillary blood and tissues. • LYMPH VESSELS – transport excess tissue fluid back into circulatory system. • LYMPH NODES – produce lymphocytes, filter out harmful bacteria. • SPLEEN – produces lymphocytes and monocytes, blood reservoir, recycles old red cells. • Thymus gland – produces T-LYMPHOCYTES

  3. LYMPH • Straw-colored fluid (similar to plasma) • Called INTERSTITIAL FLUID or tissue fluid because it is in the spaces between cells • Composed of H2O, lymphocytes, some granulocytes, O2, digested nutrients, hormones, salts, CO2 and urea. • NO red blood cells or protein molecules (too large)

  4. More about Lymph • Carries digested food, O2 and hormones to cells • Carries wastes back to capillaries for excretion • Since the lymphatic system has no pump, skeletal muscle action squeezes lymph along • Valves in lymph vessels prevent backward flow

  5. LYMPH VESSELS • Closely parallel veins • Located in almost all tissues and organs that have blood vessels • Lymph flows only in one direction – from body organs to the heart.

  6. Main Lymph Vessels • Tissue lymph enters small lymph vessels which drain into larger vessels called lymphatics • They flow into one of two large, main lymphatics – the THORACIC DUCT and Right Lymphatic Duct. • THORACIC DUCT gets lymph from left side of chest, head and neck, abdominal area and lower limbs  left subclavian vein  superior vena cava  heart.

  7. Lymph Nodes • Tiny, oval shaped - size of pinhead to size of almond • Located alone or grouped • Site for lymph production and filter for screening out harmful substances • If substance can’t be destroyed, node becomes inflamed

  8. Tonsils • Masses of lymphatic tissue that produce lymphocytes and filter bacteria – they get smaller in size as person gets older • ADENOIDS – tonsils on upper part of the throat

  9. Spleen • Sac-like mass of lymphatic tissue • Upper left abdominal cavity, just below diaphragm • Forms lymphocytes and monocytes • Filters blood • Stores large amounts of RBCs – contracts during vigorous exercise or loss of blood, to release RBCs • Destroys or removes old or fragile RBCs

  10. Thymus Gland • Upper, anterior thorax, above the heart • Thymus is also considered an endocrine gland

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