Week 7 - The Lymphatic System Flashcards
(12 cards)
What are the main functions of the lymphatic system?
Drains interstitial fluid
Transports dietary lipids and fat-soluble vitamins
Facilitates immune responses via lymphocytes and organs
What is lymph?
Lymph is the fluid transported through lymphatic vessels, derived from interstitial fluid.
What are the three main components of the lymphatic system?
Lymph
Lymphatic vessels
Lymphatic tissues and organs (e.g., lymph nodes, spleen, thymus)
What are primary lymphatic organs and their functions?
Red bone marrow and thymus
Site of lymphocyte production and maturation
What are secondary lymphatic organs and their functions?
Lymph nodes, spleen, and lymphatic nodules
Sites where immune responses are initiated
What is the basic path of lymph transport from tissues to blood?
Blood capillaries → interstitial spaces → lymphatic capillaries → lymphatic vessels → lymphatic trunks and ducts → venous blood near subclavian veins
What structures help prevent the backflow of lymph?
Valves within lymphatic vessels.
What mechanisms assist lymph movement through the lymphatic system?
Skeletal muscle pump: muscle contractions move lymph
Respiratory pump: pressure changes during breathing help move lymph
How do skeletal muscles contribute to lymph flow?
Their contractions squeeze lymphatic vessels, pushing lymph forward.
How does breathing assist lymph transport?
Inhalation lowers thoracic pressure and raises abdominal pressure, aiding lymph flow toward the thorax.
What are lymphatic capillaries and what is their role?
Small, blind-ended vessels that collect interstitial fluid and transport it as lymph.
Where does lymph re-enter the circulatory system?
At the subclavian veins via lymphatic ducts.
