Transport - the circulatory system

Question 1

Arteries (5)

Answer 1

Carry blood away from the heart.

1. Thick muscle wall to withstand the high pressure
2. Elastic tissue so it can stretch when blood is forced into it.
3. small lumen compared to wall
4. Collagen to protect it
5. Round shape

Question 2

Vein (4)

Answer 2

Carry blood to the heart.

1. valves to prevent black flow of blood
2. thin muscle layer
3. Large lumen compared to wall
4. collagen to protect it

Question 3

Capillaries

Answer 3

adapted for exchange

1. one cell thick walls