6. Where is haemoglobin found?
- In the blood
- In the red blood cells
- In the plasma
- In the white blood cells
7. What are valves (in a blood vessel) used for?
- Transport
- To stop the blood from flowing
- To direct the flow of blood
- Photosynthesis
8. What is plasma mostly made of?
- Nitrate ions
- Water
- Plasma
- Red blood cells
9. True or false, veins carry deoxygenated blood
- Yes
- True
- Emilija
- False
- Arteries
10. Which blood vessel has valves?
- Capillaries
- Veins
- Arteries
- The Titanic
