Blood Vessels Flashcards
What are blood vessels?
long tubes that transport blood to and from heart aka vasculature
Arteries carry blood ______ heart.
away from
Veins carry blood ____ heart.
back to
Most common circulatory route:
heart > arteries > arterioles > capillaries > venules > veins
Chemicals pass through capillary wall by 3 routes:
- endothelial cell cytoplasm
- intercellular clefts between endothelial cells
- filtration pores/fenestrations
2 Mechanisms of capillary exchange:
- diffusion
- transcytosis
What is transcytosis?
vesicle-mediated transport moves materials across endothelium
Substances transported through transcytosis:
fatty acids, albumin, some hormones, including insulin
Filtration occurs at which end of capillary?
arterial
Reabsorption occurs at which end of capillary?
venous
What is hydrostatic pressure?
physical force exerted against a surface by a liquid
Blood Hydrostatic Pressure
bp in any vessel
BHP is ____ on arterial end, ____ on venous end
high; low
BHP pushes fluid ___ capillary.
out of
Interstitial HP
force exerted by fluids outside the capillary
What is the main cause of COP in blood?
albumin
COP is caused by the concentration of ____.
proteins
COP is _______ at the arterial end as it is at the venous end.
the same
Oncotic Pressure = net ______ (blood COP - tissue COP)
COP
