Chapter 21- Blood Vessels Flashcards
arteries
carry blood away from the heart
arterioles
smaller arteries that branch into capillaries
capillaries
allow the exchange of substances through microcirculation
microcirculation
the flow of blood from arterioles to venules through capillaries
venules
small veins, groups of capillaries form together to create venules
veins
blood vessel that conveys blood back to the heart through valves
tunic interna
endothelium
tunic media
elastic fiber & muscle layer
tunic externa
elastic & collagen fiber
what makes veins different from arteries?
have a thinner tunic media & valves to push blood back to the heart
vascular sinus
a vein with a thin endothelial wall and a dense connective tissue cover
elastic arteries
large arteries (aorta, carotid, subclavian)
muscular arteries
medium arteries (brachial, mesenteric, popliteal)
2 veins that come together to form the hepatic portal vein
splenic & superior mesenteric
importance of hepatic portal vein
detoxify harmful substances, form glycogen, store some nutrient molecules
foramen ovale links what chambers during fetal development
R & L atrium
ductus ateriosus links what during fetal development
pulmonary trunk & aorta, develops into a ligament later on
ductus venosus
blood from umbilical veins drains here before entering inferior vena cava
average amount of blood in L for male adults
5-6 L
average amount of blood in L for female adults
4-5 L
where is most blood at in the body at one particular moment
systemic veins/venules
what % of blood is in systemic arteries/arterioles
13%
what % of blood is in pulmonary vessels
9%
