Circulatory System Quiz

Which component of blood is primarily responsible for transporting oxygen?

• Plasma

• Red blood cells

• Platelets

• White blood cells

What is the main function of platelets in the blood?

• Transporting oxygen

• Clotting blood

• Fighting infections

• Carrying nutrients

What is the role of the right atrium in the heart?

• Pumping blood to the lungs

• Preventing backflow of blood

• Receiving deoxygenated blood from the body

• Pumping oxygenated blood to the body

Which structure prevents the backflow of blood from the aorta into the ventricle?

• Right atrium

• Left ventricle

• Semilunar valve

• Pulmonary artery

What is cardiac hypertrophy?

• Decrease in heart size

• Increase in heart size and strength

• Weakening of heart muscles

• Irregular heartbeats

How does regular exercise affect stroke volume?

• Causes irregularities

• Decreases it

• Increases it

• No effect

What is the function of the vena cava?

• Prevents backflow of blood

• Pumps blood to the lungs

• Brings deoxygenated blood to the right atrium

• Carries oxygenated blood to the body

Which blood vessel carries oxygenated blood from the lungs to the heart?

• Vena cava

• Pulmonary artery

• Aorta

• Pulmonary vein

What structural feature is unique to veins compared to arteries?

• Thicker walls

• Presence of valves

• Higher pressure

• Narrow lumen

Why are arteries more elastic than veins?

• To reduce blood pressure

• To store blood

• To prevent backflow

• To accommodate high pressure blood flow