1. Capillaries only having one cell thick walls helps?
- Isolate liquid membranes
- Blood clot
- Increase the rate of diffusion
- Decrease the rate of diffusion
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2. Capillaries can do what to substances?
- Stop the travelling of blood
- Diffuse them in and out
3. Arteries carry blood to the heart
4. Veins have what?
- Small lumen
- thick layers of muscle
5. What carries blood to the heart?