Circulatory system - Blood vessels

Question 1

Arteries

Answer 1

carry blood away from the heart

Question 2

Capillaries

Answer 2

involved in the exchange of materials

Question 3

Veins

Answer 3

carry blood to the heart

Question 4

Describe Arteries

Answer 4

• strong walls
• thick walls, small lumen
• thick layer of muscle
• elastic fibres, to stretch and spring back

Question 5

Describe capillaries

Answer 5

-thin walls (one cell thick), increases diffusion
-small lumen
permeable walls, substances can diffuse in and out
-supply food and oxygen, throw away waste like CO2

Question 6

Describe veins

Answer 6

• Thin walls, low pressure
• bigger lumen, to help blood flow
• contains valves