Blood

Question 1

Arteries

Answer 1

Transport blood to the organs
Carries oxygenated blood
Contains elastic walls allowing them to stretch and spring back
Contains thick muscle walls allowing them to cope with high pressure

Question 2

Capillaries

Answer 2

Capillaries connect arteries to veins
Capillaries are very narrow with thin walls. This ensures there is a short diffusion distance the inside of the capillary and surrounding cells
Capillaries have very narrow lumens which only allow 1 cell to pass through at a time and their walls are only 1 cell thick allowing food, oxygen and waste products to be exchanged efficiently

Question 3

Veins

Answer 3

Have a wide lumen

Contain valves to prevent backflow of blood