circulatory - blood vessels

Question 1

• carry blood away at high pressure
• thick, strong
• contains muscles, elastic fibers and fibrous tissue
• narrow lumen
• helps maintain blood pressure

Answer 1

arteries

Question 2

• supply all cells with their requirements
• very thin walls, only one cell thick
• very narrow lumen for red blood cells to pass
• no need for strong walls since blood pressure has been lost

Answer 2

capillaries

Question 3

• return blood to the heart at low pressure
• thin walls
• mainly fibrous tissue
• contain far less muscle and elastic tissue than arteries
• wide lumen
• no need for strong walls
• wide lumen offers less resistance to blood flow

Answer 3

veins