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| Question | Answer |
| Which blood vessels carry blood away from the heart? | arteries |
| Which blood vessels carry blood back to the heart? | veins |
| What is the largest artery in the body? | the aorta |
| How many chambers are there in the heart? | four |
| What is the average heart beat per minute? | 70 bpm |
| How big is the heart? | About the size of your fist. |
| Why is the blood in arteries bright red? | It is high in oxygen. |
| Why is the blood in veins bluish in colour? | Most of the oxygen has been taken out. |
| Why are the walls of arteries thick and elastic? | The blood in arteries is under high pressure. |
| Why are the walls of veins thinner than arteries? | The blood in veins is only under a low pressure. |
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