1. Which type of blood enters from the left atrium?
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2. What do valves do?
- Prevent the blood from flowing backwards
- Open and close
- Let the blood flow in and out both ways
- Stop blood entering the heart
3. What do the two atria do?
- Pump blood
- Store blood
- Collect blood
- Produce blood
4. Which blood vessel has valves?
5. Which circuit carries blood to the lungs to be oxygenated?