Q.1. Name the blood vessel that brings oxygenated blood to the human heart.

Q.2. Which chamber of human heart receives oxygenated blood?

Q.3. Explain how oxygenated blood from this chamber is sent to all parts of the body.

Q.4. State two structural differences between an artery & a vein.

Q.5. Name a non-nucleated cell present in human blood & state one function of this cell.

Q.6. Why is circulation of blood in man known as double circulation?

Q.7. Which blood cell in human blood carries haemoglobin? What is its average life span?

Q.8. Why is double circulation of blood necessary in human beings?