OCR Technical Sport: Unit 1 LO3 The Cardiovascular System 1

What is the function of the valves in veins?

• To oxygenate the blood

• To prevent backflow of blood

• To decrease blood flow

• To increase blood pressure

Which component of the cardiac conduction system acts as the pacemaker?

• Bundle of His

• Sinoatrial node (SAN)

• Purkinje fibers

• Atrioventricular node (AVN)

What is the primary function of red blood cells?

• To fight infections

• To carry oxygen

• To aid in blood clotting

• To regulate blood pressure

What is the main role of capillaries in the circulatory system?

• To prevent blood backflow

• To store blood

• To transport blood at high pressure

• To facilitate gaseous exchange

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

• Aorta

• Pulmonary vein

• Vena cava

• Pulmonary artery

What is cardiac hypertrophy?

• Decrease in heart size

• Enlargement of the heart

• Weakening of the heart muscles

• Increase in blood pressure

What happens to blood pressure during exercise?

• It remains constant

• It fluctuates randomly

• It decreases

• It increases

What is the function of the septum in the heart?

• To oxygenate the blood

• To divide the left and right sides of the heart

• To pump blood

• To regulate heart rate

What is the effect of vasodilation on blood vessels?

• Increases blood flow

• Decreases blood flow

• Reduces oxygen delivery

• Prevents blood clotting

What is the average blood pressure reading?

• 100/70

• 130/85

• 120/80

• 140/90