IGCSE Circulatory System

What type of circulatory system to mammals possess?

• Single
• Double

Name the two blood vessels which leave the heart

• Pulmonary artery, aorta
• Pulmonary vein, vena cava
• Pulmonary artery, vena cava
• Pulmonary vein, aorta

What is the role of the aorta?

• To carry blood from the body to the heart
• To carry blood from the lungs to the heart
• To carry blood from the heart to the lungs
• To carry blood from the heart to the body

What is the role of the pulmonary vein?

• To carry blood from the body to the heart
• To carry blood from the lungs to the heart
• To carry blood from the heart to the lungs
• To carry blood from the heart to the body

Which valve is between the right atrium and right ventricle?

• Semilunar
• Bicuspid
• Tricuspid

Which of these is an adaptation of veins?

• Has valves
• Has thick walls
• Has narrow lumen
• Walls are one cell thick

What is the role of the capillaries?

• To provide oxygen to cells
• To maintain blood pressure
• To slow blood flow
• To allow the exchange of materials

Which of these is not how capillaries are adapted to their function?

• Thin walls so short diffusion pathway
• Lots of capillaries provide a large surface area for diffusion
• Constant blood supply maintains a concentration gradient
• Small cross-sectional area slows blood flow to allow more time for exchange

Why is it important arteries have alot of muscle and elastic tissue?

• To expand and contract around the pulse to maintain blood pressure
• To expand under high pressure
• To expand under high pressure and recoil to maintain the blood pressure
• So blood flow can be stopped if needed

What are the valves between the ventricles and arteries called?

• Semilunar
• Atrioventricular