1. Capillaries can do what to substances?
- Diffuse them in and out
- Stop the travelling of blood
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2. What carries blood to the heart?
3. The valves in vains do what?
- Keep the blood flowing in the right direction
- Keep leprechauns from entering into the blood
- Stop the blood flowing in the right direction
- To increase the blood pressure
4. Arteries branch into what?
- More arteries
5. Arteries carry blood to the heart