Module 18 Lymphatic System Flashcards
What three parts makes up the lymphatic system?
Lymph
Lymphatic vessels
Lymph Nodes
Daily 3L of leaked fluid needs to get back to the blood vessels in order for the cardiovascular system to work properly, this is solved by the ____ ______.
Lymphatic System
Once the interstitial fluid that leaks enters the lymphatic system, it is called
Lymph
The lymphatic system is also known as the basis of the ________ _______
Immune System
The lymphatic vessels are a ________ system that lymph flows towards the heart
unidirectional
Compared to blood vessels, lymphatic vessels are extremely ______ and have one way ______ that are anchored to collagen fibers preventing the collapse of capillaries
Porous
minivalves
Where are lymphatic capillaries absent?
Teeth, bone marrow, and bones and also the CNS
These are specialized lymph capillaries that are present in the intestinal mucosa and absorb waste
Lacteals
This is the fatty lymph that Lacteals absorb
Chyle
Lymph veins are like those of normal veins except they have _____ walls and more ____-
thinner
valves
Lymph is delivered into one of two large ducts, which could be the ___ or ___ duct.
Right lymphatic
Thoracic duct
This duct drains the right upper arm and the right side of the head and thorax
Right Lymphatic duct
This duct arises from the Cisterna Chyli and drains the rest of the body
Thoracic duct
What is lymph propelled by?
Pulsations of near by arteries and contractions of smooth muscle
What are the main cells of the immune system that protect against antigens?
Lymphocytes
Anything the body perceives as ______ the lymphocytes attack
Foreign
These types of lymphocytes manage the immune response, they attack and destroy foreign objects
T cells
these types of lymphocytes produce plasma cells which secrete antibodies
B cells
These lymphocytes phagocytize foreign substances and help activate T cells
Macrophages
These lymphocytes capture antigens and deliver them to lymph nodes
Dendritic cells
These lymphocytes produce stroma and supports other cells in lymphoid organs
Reticular cells
This houses and provides a proliferation site for lymphocytes
Lymphoid tissue
This lymphatic tissue comprises of scattered reticular tissue elements in every body organ
Diffuse lymphatic tissue
This organization of lymphoid tissue is solid spherical bodies of tightly packed reticular elements of cells
Lymphatic follicles
These are embedded in connective tissue in clusters along the lymphatic vessels, they seen readily in axillary, inguinal, and cervical regions of the body
Lymph Nodes
These macrophages destroy microorganisms and debris in lymph nodes
Filter lymph
This part of the lymph node contains follicles with germinal centers heavy with diving B cells
Cortex
This extends inward and divides the node into compartments
Trabeculae
these extend from the medulla inward from the cortex and contain B and T cells
medullary cords
Lymph enters the circulation through lymph nodes through the _____ lymphatic vessels and exits through the _____ lymphatic vessels
Afferent
Efferent
This is the largest lymphatic organ
Spleen
the functions of the spleen is to cleanse the blood of _____ and _____ and debris
Aged blood cells, Platelets
Then spleen stores breakdown platelets for products of RBC that can be reused like
Iron
The spleen has two distinct area, this part is around the central arteries, mostly lymphocytes non reticular fibers that are involved in immune functions
White pulp
This distinct area of the spleen that is in venous sinuses and splenic cords, they are rich in marcophages for the disposal of worn out RBCs and bloodborne pathogens
Red Pulp
This lymphatic organ disappears when you become an adult,it is the basis of your immune system
Thymus
These provide an environment in which T lymphocytes become immunocompetent
Thymocytes
This part of the thymus contains fewer lymphocytes and thymic (Hassalls) corpuscles involved in regulatory T development
Medulla
This is the simplest Lymphatic organ that forms a ring around the pharynx
Tonsils
This is the tonsil that is at the posterior end of the coral cavity
Palatine Tonsil
This is a tonsil that is grouped at the base of the tongue
Lingual Tonsil
This is a tonsil in the posterior wall of the nasopharynx
Pharyngeal Tonsil
This tonsil is surrounding the openings of the auditory tube into the pharynx
Tubal Tonsils
This lymphatic organ is not fully capsulated
Tonsils
These are clusters of lymphoid follicles in the wall, distal portion of the small intestine
Peyers Patches
These destroy bacteria preventing them from breaching the intestinal wall
Peyers patches in the appendix (large intestines)
This protects against digestive and respiratory systems from foreign matter
MALT
or Mucosa-associated lymphatic tissue
Where is the MALT tissue in the digestive tract?
Peyers patch
tonsils
appendix
Where are the MALT tissues in the respiratory tract?
Lymphoid nodules in the walls of bronchi
Epithelial tissue overlying tonsil masses invaginates forming what?
Tonsillar crypts
