Heart

5. Blood vessels deliver oxygen-rich blood from the heart to the tissues of the body.
8. Blood vessels that carry deoxygenated blood from tissues back to the heart.
12. what kind of blood is delivered to the heart via the superior vena cava.
13. upper thin-walled chambers of heart.
15. valves located between the upper Atria and the lower ventricles.
16. flaps that act as a door for blood to enter or exit through.
17. What kind of blood flows in the pulmonary vein and in the arteries.

1. deoxygenated blood is rich in this.
2. a small vein that is collecting blood from a capillary.
3. is a large vein that carries blood to the heart from other areas.
4. lower thick-walled chambers of the heart.
6. the internal pacemaker controls the beat of the heart.
7. pair of spongy air-filled organs is located on either side of the chest.
9. a small branch of an artery leads into a capillary.
10. is a large artery that carries oxygen-rich blood from the left ventricle of the heart to other parts of the body.
11. are tiny blood vessels that connect your arteries and veins.
14. becoming slower.