Studied by 0 people
Looks like no one added any tags here yet for you.
What is the lymphatic system?
this is a system that consists of several structures and organs that contain lymphatic tissue, bone marrow, and a fluid called lymph that flows within lymphatic vessels and the function of this system is to drain excess interstitial fluid(lymph), transport nutrients, carry out immune responses.
What are lacteals?
they are specialized lymph capillaries that drain dietary lipids absorbed from small intestines
Whatr are lymphatic capillaries and it’s function?
They are microscopic vessels located throughout tissue spaces of the body. They’re microscopic and accept/convey lymph to larger vessels.
What are lymphatic vessels and it’s function?
They’re similar in structure to veins, they’re thin & have three layers (tunics) that contain valves to ensure one way flow. They’re located throughout the body in a network system collecting and transporting lymph fluid.
From the lymphatic vessels, lymph passes through lymph nodes and then into lymph trunks. What are the lymph trunks?
the lymph trunks include the lumbar, intestinal, bronchomediastinal, subclavian, and jugular trunks.
Lymph trunks then merge to form either the thoracic duct or the right lymphatic duct
What is the direction/flow of lymph throughout the body?
Interstitial fluid —> lymph capillaries —> lymph vessels —>lymph trunks —> lymph ducts —>subclavian veins
What are the 2 primary lymphatic organs where immune cells become immunocompetent?
-Red bone marrow
-Thymus
What are the secondary lymphatic organs and tissues?
-Lymph nodes
-Spleen
-Lymphatic nodules
What are lymphatic nodules?
These are masses of lymphatic tissue that are not surrounded by a capsule and are scattered throughout the lamina propria of mucous membranes lining the gastrointestinal, urinary, and reproductive tracts and respiratory airways.
Phagocytosis:
process by which cells engulf and filter foreign substances and dead cells.
Immunological surveillance is the body’s monitoring and elimination of abnormal cells like cancerous cells is carried out by a variety of T cells which include:
cytotoxic cells, NK cells, macrophages, and dendritic cells.
The spleen is the largest single mass of lymphatic tissue in the body. True or False?
True
What is metastasis?
it is the spread of disease from one part of the body to another
What is innate immunity?
examples: skin and mucous membranes, internal defense
Defense mechanism we are born with that provides general protection against invasion by wide range of pathogens.
Adaptive immunity
Involves action of specific lymphocytes that target a specific pathogen or foreign substance. It has both specificity and memory.
examples: antigen receptor, epitope, antibody, clonal selection
