Please enable JavaScript.
Coggle requires JavaScript to display documents.
Lymphatic system Beatrice Mwachugu (Components of the lymphatic system…
Lymphatic system Beatrice Mwachugu
Functions
Absorption of fatty acids
Removal of excess fluids from body tissues into the blood
Have lymphocytes that enable the body to fight diseases and infections
Components of the lymphatic system
Lymphatic vessels
collect excess fluid from tissues and return it back to blood stream.
Returns leaked proteins from surrounding tissues to bloodstream.
Properties of the lymph vessles
Unlike blood which circulates blood all over the body, lymphatic vessels form a one way system
Path of lymphatic circulation
Lymphatic vessels
Lymph flows in the lymphatic vessles at a slow rate
Lymphatic trunk
Drain lymph from large areas of the body
Lymphatic duct
Largest lymphatic vessels where the lymph is drained from the lymphatic trunk
Venous circulation
Lymph is transported to the veins at the root of the neck
Lymphatic capillaries
very permeable to collect excess tissue fluid
Lymph
Excess fluid that is in the lymphatic vessls
Blood
body fluid that transports nutrients and oxygen to cells
Interstitial fluid
Fluid in between cells
Lymphatic cells
T lymphocytes
Attacks foreign cell directly
Binds to a cell, secretes proteins that lyse the cell membrane which signals the cells to die.
B lymphocytes
Gives rise to plasma cells that secrete antibodies.
Lymph Organs
Thymus
Located superior thorax and inferior neckjust posterior to sternum
Fuction
Site for the formation of imature lymphocytes into T lymphocytes
Spleen
Left upper abdomen
Function
Removal of blood borne antigens
Removal and destruction of aged defective blood cells
Lymph nodes
Cleanse lymph of pathogens
Tonsils
Located in the pharynx
Trap bacteria and pathogens and kill them because they have pathogens.
Lymph Nodes
Bean shaped organs that cleanse the lymph of pathogens
Location of Lymph nodes
Axillary nodes
in armpits and inguinal region filter lymph from upper and lower limbs
Cervical nodes
Receive lymph from head and neck
Nodes in mediastinum
Receive lymph from thoracic viscera
Aortic nodes
filter lymph form posterior abdominal wall
iliac nodes
Filter lymph from pelvic organs and lower limbs
Structure
Affarent vessels
Lymph enters the nodes
Efferent vessels
Lymph leaves the nodes
Lymph sinuses
macrophages remove lymph bone pathogens
Capsule
DCT has trabeculaeto divide node into compartments
MALT
Concentrations of lymphoid tissue in mucosa membranes like digestive,respiratory,urinary etc
Fight against infection
Site where lymphocytes become activated and where effector and memory lymphocytes are activated
Types of leukocytes
Granulocytes
Eosinophils
ends allergic reactions by phagotysing allergens
Basophils
Produce histamine that casues inflamation
Neutrophils
Consume bacteria
Agranulocytes
Monocytes
Involved in phagocytosis
Lymphocyes
have antigens that fight antibodies