PQ 8.2 THE VASCULAR SYSTEM AND BLOOD FLOW

What is the main function of capillaries in the cardiovascular system?

• Carrying deoxygenated blood to the lungs

• Regulating blood distribution to the various tissues

• Exchanging gases and nutrients with the tissues

• Transporting blood away from the heart

Which type of blood vessels have very thick muscular walls and carry blood away from the heart?

• Arterioles

• Capillaries

• Arteries

• Venules

What is the main role of arteries in the cardiovascular system?

• Returning blood to the heart

• Exchanging gases and nutrients with the tissues

• Regulating blood distribution to the various tissues

• Carrying oxygenated blood away from the heart

What is the function of the skeletal muscle pump in the return of blood to the heart?

• Increasing the delivery of blood to the working muscle

• Regulating blood clotting

• Pushing or massaging blood back to the heart with each muscle contraction

• Assisting in the distribution of blood to different organs

Which component makes up about 55 percent of blood and is composed mostly of water?

• Plasma

• Red blood cells

• Platelets

• White blood cells

What is the main function of veins in the cardiovascular system?

• Regulating blood distribution to the various tissues

• Carrying oxygenated blood away from the heart

• Exchanging gases and nutrients with the tissues

• Returning blood to the heart for another trip throughout the vascular system

What is the role of the thoracic pump in the return of blood to the heart?

• Creating a difference in pressure between the veins in the chest and abdominal cavities

• Pushing or massaging blood back to the heart with each muscle contraction

• Regulating blood clotting

• Assisting in the distribution of blood to different organs

Which type of blood vessels are surrounded by rings of smooth muscle and can contract or relax to regulate blood flow?

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What is the main role of the nervous system in the return of blood to the heart?

• Assisting in the distribution of blood to different organs

• Pushing or massaging blood back to the heart with each muscle contraction

• Causing veins to slightly constrict to return more blood to the heart

• Creating a difference in pressure between the veins in the chest and abdominal cavities

What is the function of autoregulation in the cardiovascular system?

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