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What is the function of the pulmonary vein?

• It carries oxygen-rich red blood cells from the lungs to the left side of the heart.

• It carries oxygen-poor blood from the heart to the lungs.

• It carries oxygen-rich blood from the heart to the body.

• It carries oxygen-poor blood from the body to the heart.

What is the primary function of the heart in the circulatory system?

• To filter waste products from the blood.

• To produce oxygen for the body.

• To pump blood to various organs.

• To store blood cells.

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What is the largest blood vessel in the human body?

• Capillary

• Artery

• Vein

• Aorta

What happens to oxygen when it reaches the cells in organs like the stomach?

• It is stored for future use.

• It is converted into carbon dioxide.

• It is used by cells to produce energy.

• It helps in filtering the blood.

How many main types of blood circulation systems are there in humans?

• One

• Two

• Three

• Four