chapter 21 Flashcards
main function is to return excess tissue fluid to blood vascular system
lymphatic system
collect tissue fluid from loose connective tissue
-carry fluid to great veins in the neck
-lymph flows only toward the heart
functions;
-collect excess tissue fluid and blood proteins
-return tissue fluid and blood proteins to bloodstream
lymphatic vessels
- protects our bodies from foreign organisms
- confers immunity to disease
- main components
- lymphocytes, lymphoid tissue, lymphoid organs
immune system
-once tissue fluid is within lymphatic vessels its termed
lymph
- smallest lymph vessels
- first to receive lymph
- highly permeable vessels
lymph capillaries
collect from lymph capillaries
-lymph nodes are scattered along collection vessels
collecting lymphatic vessels
collect lymph from collecting vessels
lymph trunks
empty into veins of the neck
lymph ducts
- located near blood capillaries
- recieve tissue fluid from CT
- high permeability of lymphatic capillaries allows entrance of tissue fluid, protein molecules, bacteria, viruses and cancer cells
lymphatic capillaries
- specialized lymphatic capillaries
- located in the villi of small intestines
- receive digested fats
- fatty lymph is termed cycle
lacteals
- flow of lymph is not aided by the heartbeat
- lymph is propelled by 3 weaker mechanisms
- bulging of skeletal muscles
- pulsing of nearby arteries
- tunica media of the lymph vessels
superifical lymph nodes located in
- cervical region
- axillary region
- inguinal region
deep lymph nodes are
- tracheobronchial lymph nodes
- aortic lymph nodes
- iliac lymph nodes
surrounds lymph nodes
fibrous capsule
connective tissue strands extend inward to divide lymph node into segments
trabeculae
