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