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29 Cards in this Set
- Front
- Back
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Lymph |
Is a clear fluid that resembles plasma. |
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Three main functions of lymphatic system? |
* return interstitial fluid to the blood * absorbs fat-soluble vitamins * helps body defend itself against infection. |
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Lymphatic vessel |
Include lymphatic capillaries and several larger lymphatic vessels. |
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Lymphatic ducts |
Right lymphatic duct Thoracic duct |
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Right lymphatic duct |
Right arm and right side of the head and thorax drains here. |
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Thoracic duct |
Drains the rest of the body |
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Movement thru the lymphatic vessels |
"Milking" Respiration movement Rhytmic contraction of smooth ms |
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"Milking" action of the skeletal muscles |
As the skeletal muscles contract, they squeeze the surrounding lymphatic vessels |
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Respiration |
Contraction and relaxation of the chest muscles cause changes in the pressure within the thorax. The changes increase the flow of lymph. |
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Rhytmic contraction of smooth muscles |
The contraction and relaxation in smooth ms cause lymph to flow. |
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Lymphoid organs |
Lymph nodes Tonsils Thymus gland Spleen |
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Lymph nodes |
Are small pea-shaped patches of lymphatic tissue strategically located to filter the lymph as it flows through the lymphatic vessels. |
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Tonsils |
Are partially encapsulated lymph nodes in the throat area. |
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Thymus gland |
Is located in the mediastinumof the thoracic cavity. After puberty, the gland shrinks or involutes, but remains active throughout life. |
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Thymosins |
Is a hormone secreted by the thymus gland. |
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Spleen |
Is the largest lymphoid organ in the bod. Located left upper quadrant (LUQ). Spleen filters blood rather than lymph. Microorganisms trapped by the spleen are destroyed by the leukocytes in the spleen. |
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Platelets are stored? |
In the spleen. Create the clotting factor. |
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Lymph nodes carry |
*Lymphocytes and macrophages *Immunity,phagocytes |
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Lymph sinuses are filled with |
Lymph |
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CH. 21 |
Immune system |
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Immunity |
The human body has an elaborate defense system. |
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Nonspecific immunity |
Protects the body against many diffrent types of foreign agents. |
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First line of defense |
Mechanical barriers (skin) Chemical barriers (acid, tear) Reflexes (sneezing, coughing) |
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Second line of defense |
Phagocytosis (cell eating) Inflammation (irritant) Fever (pyrexia, high temp) Protective proteins (interferons, complement proteins. Protection) Natural killer cells(special lymphocytes) |
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Diapedesis |
Neutrophils and monocytes squeeze through tiny gaps. |
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Chemotaxis |
Is the signaling to attract phagocytes. |
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Specific immunity (third line of defense) |
Specific immunity homes in on a foreign substance and provides protection against one specific substance but not others. |
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Antigens |
Is the substance that stimulatea the formation of antibodies. |
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Lymphocytes |
Two types of lymphocytes are T and B lymphocytes |
