Lymph Flashcards
Where is blood pressure higher in a capillary?
The arterial end (higher than the venous end)
What does the high blood pressure at the arterial end cause?
A high hydrostatic pressure at the arterial end
What is in capillary walls that allow fluid through?
fenestrations
Why is fluid forces out of the capillary?
the fluid is forced out down the hydrostatic pressure gradient.
which molecules leave?
Glucose, Oxygen and other small molecules
apart from the hydrostatic pressure gradient, what causes molecules to leave the capillaries?
Diffusion
what do all the things that leave the capillary make?
Tissue fluid that bathes the cells
Which molecules remain in the capillary?
Molecules that are too big, for example, erythrocytes and large plasma proteins.
How does water move into the capillary at the venous end?
Osmosis (this is due to the low oncotic pressure at the venous end)
where is excess tissue fluid drained?
into the lymph system
What do lymph vessels do?
join together and return fluid to the blood
What moves the lymph fluid along?
Hydrostatic pressure differences
contraction of skeletal muscles
What prevents the backflow of lymph fluid?
Valves
What is the process of plasma separation under pressure known as?
Ultrafiltration
Why does the hydrostatic pressure drop over the length of the capillary bed?
The pulse is weakened by the bloods movement through narrow capillaries with no elastic tissues
