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Lecture Ch. 20

Lymphatic System

when fluid enters the lymphatic vessels it is called what? lymph
function of lymphatics or lymphatic vessels up to 3 L of fluid each day that is not reabsorbed and must be returned to the cardiovascualar system.
Fluid flow--importance of lympahtic vessels forced out of the arterial ends of capillaries and reabsorbed at the venous ends.
Lymphatics form a ONE WAY system that flows TOWARD the heart
Lymphatic systems starts where lymph capillaries
No lymph capillaries where? teeth, bones, or CNS
what else is returned by lymph capillaries? proteins that leak from blood capillaries
Lymph capillaries can also take up what? cell debris, bacteria viruses, cancer cells...then filtered by lymph nodes.
lymph capillaries flow into larger vessels which follow the arteries
right lymphatic duct empties into the right subclavian vein
right lymphatic duct lymph from the right upper extremity, right side of head and neck and right thorax drains here
inflammation of the lymph vessels lyphangitis
the flow of lymph assisted by muscular pumps, the respiratory pump and one-way valves.
increased movement of an extremity causes an increase or decrease in lymph flow increase
blockage of lymphatics cause tissue swelling known as lymphedema-distal to the site of blockage.
lymphoid cells lymphocytes
2 types of lymphocytes T cells and B cells
manage the overall immune response...T or B cells? T cells
divide to become plasma cells & then make antibodies B cells
antibodies attach to antigens
antigens stimulate an immune response
consume foreign material and cellular debris macrophages aka phagocytes
lymphoid tissues throughout the body function storage and proliferation site for lymphocytes
macrophages vs. lymphocytes macro-stay in one place...lymph-throughout whole body
the principle lymphoid organs in the body lymph nodes
clusters of lymph nodes found where in the body? cervical, axillary, inguinal regions
1 functions of lymph nodes 1) act as filters....macrophages remove debris from the lymph b4 xfer back to the blood
other function of lymph nodes help activate the immune system---monitor the lymph for the presence of foreign antigens
size and shape of lymph nodes kidney bean shape less than 1 in. in length
each lymph node is surrounded by what? a fibrous capsule
lymph enters through convex side of a lymph node through AFFERENT lymphatic vessels
lymph exits at the hilum via EFFERENT lymphatic vessels
the first lymph node clinincally named the sentinel node
lymph passes through many nodes before returned to blood stream. T or F True
infected nodes or nodes draining an infected area become swollen and tender
cancer cells in a lymph node cause enlargement USUALLY non tender
other lymphoid organs spleen, thymus, tonsils, clusters of lymph tissue
location of spleen upper quadrant of abdominal cavity posterior and lateral to the stomach
the hilum of the spleen where the splenic artery and vein enter
spleen's main function remove old and defective RBCs and platelets as well as foreign material and deris-bacteria from the blood
other function of the spleen site for lymphocyte proliferation and immune surveillance
spleen stores and release the breakdown products of the RBCs and stores platelets
spleen surrounded by thin fibrous capsule that can rupture easily
removal of the spleen is called? splenectomy
splenectomy incrase the risk of bacterial infection in the bloodstream
location of the thymus anterior superior mediastinum
thymus involved in T-cell maturation
thymus dev.important in childhood
thymus does what after puberty atrophies and is replaced by fatty and fibrous tissue
the thymus is direction invovled in fighting infection. T or F FALSE
location of tonsils beneath the mucosa and forma ring of lymphoid tissue around the entrace to the pharynx-the throat
palatine tonsils posterior aspet of the oral cavity
lingual tonsils base of the tongue
pharyngeal tonsils aka adenoids-posterior wall of the nasopharynx
tonsils function to do what remove pathogens that get through the mucosa of these areas
clusters of lymphoid tissue found in the wall of the distal portion of the small intestine (Peyer's patches) and in the wall of the appendix
Created by: 1671530535



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