Unit I: Lymphatic System and Immunity. Competency: 1H09. Analyze the anatomy and physiology of the lymphatic system. Specific Objectives: 1H09.01- Describe the structure of the lymphatic system. 1H09.02- Analyze the function of the lymphatic system.
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1. LYMPH- fluid that goes between capillary blood and tissues.
They transport excess tissue fluid back into circulatory system.
Produce lymphocytes, filter out harmful bacteria. A cluster of lymph nodes can be found under the arms and neck.
Produces lymphocytes and monocytes, it’s a blood reservoir, recycles old red cells.
After puberty, the gland begins to shrink and is replaced by connective tissue and fat. The main function of the thymus gland is in the processing and maturation of special lymphocytes called T-cells.
Straw-colored fluid (similar to plasma)
INTERSTITIAL FLUID or tissue fluid because it is in the spacesbetween cells
Composed of H2O, lymphocytes, some granulocytes, O2, digested nutrients, hormones, salts, CO2, and urea.
NO red blood cells or protein molecules (too large)
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 prevent backward flow
Closely parallel veins
Located in almost all tissues and organs that have blood vessels
Tissue lymph enter small lymph vessels which drain into larger vessels called lymphatics – they flow into one of two large, main lymphatics – the THORACIC DUCT (largest vessel) 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.
Lymph flows only in one direction – from body organs to the heart.
Immunity – the body’s ability to resist bacterial invasion and disease. Two general types – natural and acquired.
NATURAL IMMUNITY – at birth, inherited and permanent. Includes:
Mucus and tears
ACQUIRED IMMUNITY – body’s reaction to invaders
ADENITIS – swelling in the lymph glands
Cancer of the lymph noses, painless swelling of lymph nodes is early symptoms.
Rx – chemotherapy and radiation
Enlargement of the lymph nodes, occurs when infection is present and body is attempting to fight off the infection.
Severe, sometimes fatal allergic reaction
Antigen-antibody reaction stimulates a massive secretion of histamine
Symptoms – breathing problems, headache, facial swelling, falling blood pressure, stomach cramps, and vomiting
Rx - adrenaline
Emergency treatment for anaphylaxis