Circulatory System: Blood Vessels 2 Quiz

What is the function of capillaries in the circulatory system?

• Carry blood back to the heart

• Transport blood at high pressures

• Exchange nutrients and oxygen with the tissues

• Carry blood away from the heart

What is the structure of arteries that allows them to bear high pressures?

• Single cell thick walls

• Thick layer of muscle and elastic tissue

• Thin walls with valves

• Permeable walls for easy diffusion

What is the role of veins in the circulatory system?

• Bear high pressures

• Transport blood back to the heart

• Carry blood away from the heart

• Exchange substances with cells

Why do capillaries have a huge total cross-sectional area?

• To allow easy diffusion of substances

• To transport blood at high pressures

• To ensure slow blood flow

• To prevent blood from flowing backwards

What is the function of valves in veins?

• To exchange substances with cells

• To prevent blood from flowing backwards

• To bear high pressures

• To ensure slow blood flow

What is the main difference in the structure of arteries and veins?

• Arteries have thin walls, veins have thick walls

• Arteries have valves, veins have no valves

• Arteries have small lumen, veins have large lumen

• Arteries have thick elastic and muscle layers, veins have thin walls

Why does blood flow more slowly in capillaries compared to arteries?

• Due to high pressures in capillaries

• Due to small lumen of capillaries

• Due to huge total cross-sectional area of capillaries

• Due to thick elastic and muscle layers in capillaries

What is the function of the thick layer of muscle tissue in arteries?

• To ensure slow blood flow

• To bear high pressures

• To prevent blood from flowing backwards

• To exchange substances with cells