Lymphatic system Flashcards
(56 cards)
The rate of flow of fluid is dependant on what
blood pressure within the capillaries
The higher the flow of fluid the greater or smaller the leakage
greater
Swollen limbs and extremities are caused by what
result of high blood pressures
A signficant portion of fluid that has not been reabsorbed by capillaries remains where and as what
within the tissues as interstitial fluid
A large accumulation of interstitial fluid is called what
oedema
What are lymphatic vessels
drainage system of special blind-ended capillary structures
what is the function of lymphatic system via the vessels
return the extracellular fluid to the blood stream
What is the fluid within the lymphatic vessels called
Lymph
Are the lymphatic vessels or blood capillaries more permeable
Lymphatic vessels
How are lymphatic capillaries similar to blood capillaries
one layer of endothelium
How do the endothelial cells in the lymphatic capillaries combine
overlap to forms flap like mini valves
What is the need for cellular overlapping in the lymphatic capillaries
To maintain the amount of fluid inside the capillary. So when the volume of lymph increases, the internal pressure forces the flaps to close
Where are the highly specialised lymphatic capillaries called lacteals located
small intestine
Why is the lymph from lacteals milky as opposed to clear?
Fat is present as the lacteals absorb fats from the diet
what is fat filled lymph from lacteals called
chyle
Lymphatic vessels converge into larger vessels called what
Lymphatic ducts
Name the 2 major lymphatic ducts
Right and thoracic
The right lymphatic duct does what
collects lymph from the right arm and the right side of the head and chest
The thoracic duct does what
collects lymph from the rest of the body
The 2 major lymphatic ducts drain lymph directly back into what
major veins located above the heart
What 4 things are required to move lymph through the vessels (similar to blood transportation) to propel lymph towards the bloodstream for recycling
1) contraction of skeletal muscles 2) breathing 3) small valves to prevent backflow 4) smooth muscle cells located in walls of ducts which contract in rhythmic manner
Swelling of lymphoid tissues is caused by what
increase in permeability of blood vessels at sites of inflammation
Cancerous cells that have broken free of solid tumors can end up in lymphatic vessels and be transported to other parts of the body, this is called what
metastasis which can give rise to secondary tumors
What are lymph nodes
small filter units through which lymph travels before returning to blood stream
