Blood vessels

Question 1

Features of wall of capillaries

Answer 1

Walls are very thin with no elastic fibres, smooth muscle or collagen

Question 2

Why are capillaries walls thin?

Answer 2

Ensures short diffusion distance

Question 3

Arteries wall

Answer 3

.Thick
.Lots of collagen
.Lots of elastic fibres
.Lots of smooth muscle

Question 4

Vein walls

Answer 4

.Thin
.Less collagen
.Less elastic fibres
.Less smooth muscle

Question 5

Difference between arteries and arterioles

Answer 5

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

Question 6

How do veins prevent pressure from being too low?

Answer 6

Larger veins are located between large muscles so when they contract it helps to squeeze blood towards the heart