Blood vessels Flashcards
1
Q
Features of wall of capillaries
A
Walls are very thin with no elastic fibres, smooth muscle or collagen
2
Q
Why are capillaries walls thin?
A
Ensures short diffusion distance
3
Q
Arteries wall
A
.Thick
.Lots of collagen
.Lots of elastic fibres
.Lots of smooth muscle
4
Q
Vein walls
A
.Thin
.Less collagen
.Less elastic fibres
.Less smooth muscle
5
Q
Difference between arteries and arterioles
A
Arterioles have lots smooth muscle because they control how much blood goes to capillaries, more vasoconstriction and vasodilation
Arterioles have less elastin, collagens and smooth muscles in their walls
6
Q
How do veins prevent pressure from being too low?
A
Larger veins are located between large muscles so when they contract it helps to squeeze blood towards the heart
