veins

Question 1

veins

Answer 1

transport blood to the heart (usually at low pressure)

Question 2

In contrast, veins receive blood that has passed through …………

blood is at ………… pressure

and must be returned to ………..

Answer 2

veins receive blood that has passed through capillary networks; blood is at very low pressure and must be returned to the heart

Question 3

The wall of the vein is relatively

what layers do veins contain

Answer 3

thin with thinner layers of collagen, smooth muscle and elastic fibres

Question 4

The lumen of the vein is much larger than that of an artery

which helps

Answer 4

ensure it is still transported efficiently as blood moves much slower

Question 5

Veins contain valves that prevent

Answer 5

the backflow of blood, helping return blood to the heart