Q. Consider the following statements about arteries in the human circulatory system:

1. They are thin-walled blood vessels.
2. They contain valves that prevent backflow.
3. They always carry oxygenated blood.
4. They carry blood away from the heart.

Which of the above statements is / are correct?
Answer: Only 4
Notes: Arteries are thick-walled vessels that transport blood away from the heart. They do not contain valves and are not thin-walled; these are properties of veins. While most arteries carry oxygenated blood, pulmonary and umbilical arteries are exceptions. Therefore, only statement 4 accurately describes all arteries in the human circulatory system.