OCR Technical Sport: Unit 1 LO4 The Respiratory System

What is the primary function of the pulmonary artery?

• To carry deoxygenated blood to the heart

• To carry oxygenated blood to the lungs

• To carry deoxygenated blood to the lungs

• To carry oxygenated blood to the heart

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

• Bundle of His

• Sino-atrial node (SAN)

• Purkinje fibers

• Atrioventricular node (AVN)

What is the main role of red blood cells in the body?

• To regulate blood pressure

• To fight infections

• To carry oxygen to muscles

• To aid in blood clotting

What is the effect of vasodilation on blood vessels?

• Increases blood flow

• Decreases oxygen delivery

• Increases blood pressure

• Decreases blood flow

What is cardiac hypertrophy?

• Decrease in blood volume

• Decrease in heart size

• Enlargement of the heart

• Weakening of the heart muscles

Which blood vessel type contains valves to prevent backflow?

• Arteries

• Capillaries

• Veins

• Arterioles

What is the primary function of the left ventricle?

• To receive oxygenated blood from the lungs

• To pump deoxygenated blood to the lungs

• To pump oxygenated blood to the body

• To receive deoxygenated blood from the body

What happens to blood pressure during exercise?

• It decreases

• It fluctuates randomly

• It remains constant

• It increases

What is the role of the atrioventricular node (AVN) during exercise?

• To decrease blood pressure

• To increase heart rate

• To prevent backflow of blood

• To slow down the impulse for atrial contraction

What is the primary cause of anticipatory rise in heart rate before exercise?

• Decrease in blood pressure

• Release of adrenaline

• Decrease in carbon dioxide levels

• Increase in oxygen levels