Veins:
A) carry blood away from the heart
B) branch into smaller vessels called arterioles
C) transport oxygen-rich blood
D) operate under high pressure
E) often have valves to prevent the backflow of blood
Answer: E
Veins:
A) carry blood away from the heart
B) branch into smaller vessels called arterioles
C) transport oxygen-rich blood
D) operate under high pressure
E) often have valves to prevent the backflow of blood