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| Question | Answer |
| How many atria are there in the heart? | 2 |
| Why do diagrams of the heart show the left ventricle on the right side of the heart? | Because the diagram is shown from the perspective of another person looking at someone's heart. |
| What is a tissue? | A tissue is a thing that's in your body. It is a group of cells. |
| What is an organ? | A group of tissues. |
| What is an organ system? | A group of organs. |
| What is an organism? | A group of organ systems. |
| Describe how the surface area for the exchange of substances is made so large in tissues. | I don't know |
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