Which of the following is the primary function of the heart?

• To pump oxygen-rich blood to the body

• To absorb nutrients from food

• To produce oxygen for the blood

• To filter waste from the blood

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

• To carry blood away from the heart

• To transport oxygen to the lungs

• To filter blood

• To collect waste products from the blood

Which part of the circulatory system carries oxygen-poor blood back to the heart?

• Veins

• Arteries

• Capillaries

• Ventricles

Imagine a scenario where the valves in the veins are not functioning correctly. Which of the following is the most likely consequence?

• Blood will flow backward, causing pooling in certain areas of the body.

• The heart will pump blood too quickly through the veins.

• Oxygen-rich blood will not reach the lungs.

• Blood pressure will increase significantly in the arteries.

If the heart's left ventricle fails to function effectively, how might this affect the circulatory system?

• Oxygen-poor blood will be unable to reach the lungs for oxygenation.

• Blood may not reach the body tissues effectively, causing fatigue and weakness.

• Blood flow to the brain will increase, leading to high oxygen levels in the brain.

• The heart will start pumping blood directly into the veins.