Lymphatic System Flashcards
Lymphatic Vessel Structure
The movement of lymph relies on skeletal muscle contractions, while inner valves prevent backflow.
Function of the Lymphatic System
lymphatic vessels return excess tissue fluid to the bloodstream (R. lymphatic and thoracic ducts)
What is Edema?
Retention of fluids in the tissue due to blockage of the flow of lymph
What are lacteals
located in small intestine, absorbing fats (glycerol & fatty acids), transporting them to the blood stream
Lymphoid organs
They work with the immune system to help defend against diseases
The Red Bone Marrow
All blood cells are produced by stem cells
Primary vs Secondary Lymphoid Organs (brief description)
Lymphocytes develop and mature (thymus and bone marrow)
the secondary ones respond then are activated (spleen and lymph nodes)
Thymus Gland
T lymphocytes mature here
Produces hormone called THYMOSIN that causes t cells to mature
Lymph Nodes
small ovoid structure, filters lymphatic fluid, and contains WBC
Spleen
Contains lymph vessels and WBC
Innate Immunity
Functions without previous exposure to pathogens
Adaptive Immunity
It starts when innate response fails to remove invaders (5-7 days to activate)
Immune- Physical and Chemical Barriers
Skin, mucous membranes lining the respiratory, digestive, and urinary tracts, oil glands in the skin, ciliated cells (clean particles in mucus), and acid in the stomach all help to keep pathogens from entering the body.
Immune- Inflammatory response
The injury site has redness, heat, swelling, & pain. Damaged tissue as well as WBC release HISTAMINE
Macrophages and Dendritic cells
Engulf pathogens and release cytokines, inducing fever, promoting WBC, and activating other immune cells
