Cardiovascular System

6. I am one of the 3 muscle tissue types. I line the "hollow" organs and some blood vessels.
9. I am the largest artery in the body. I carry oxygen-rich blood out of the heart. I am shaped like an arch.
11. I am one of the parts of blood. I am made in the marrow and carry oxygen around the body.
13. I am what happens when you take an organ out of one person and put it in a different person.
14. I am a 1-way door found in the heart. I prevent blood from moving backwards. There are 4 of me.
15. I am the color of oxygen-rich blood.
16. I am the yellowish part of blood. I make up about 55% of blood, and about 92% of me is water.

1. We are a group of cells located in the right atrium. We send out electricity to the rest of the heart to make it beat.
2. I am a part of blood. When there is a cut or scrape, I show up and stop the bleeding.
3. I am the color of oxygen-poor blood.
4. I am one of the chambers of the heart. I am bigger than the other kind and am located "downstairs".
5. I am one of the parts of blood. I am made in the marrow and go around attacking germs & diseases.
7. I am the molecule that humans need constantly. Red blood cells transport me around the body.
8. There are 4 of me in the heart. Two of me are "upstairs", two of me are "downstairs". We fill with blood.
10. I am the part of the body that tells the heart to beat.
12. I am one of the chambers of the heart. I am smaller than the other type and am located "upstairs".