Veins

Question 1

What direction do veins carry blood?

Answer 1

Towards heart

Question 2

What are 3 features of veins?

Answer 2

Wider lumen than arteries
Thinner layers of muscle & elastic tissue
Valves

Question 3

Why do veins have a wider lumen than arteries?

Answer 3

Blood is at low pressure

Question 4

What do valves do?

Answer 4

Ensure that blood does not flow backwards

Question 5

What do skeletal muscles do when they contract?

Answer 5

Compress veins, helping increase pressure & push blood along

Question 6

What do closed circulatory systems increase?

Answer 6

Pressure & speed of blood flow