Heart

1. flaps that act as a door for blood to enter or exit through.
5. upper thin-walled chambers of heart.
6. is a large artery that carries oxygen-rich blood from the left ventricle of the heart to other parts of the body.
8. valves located between the upper Atria and the lower ventricles.
9. are tiny blood vessels that connect your arteries and veins.
11. deoxygenated blood is rich in this.
13. lower thick-walled chambers of the heart.
14. a small vein that is collecting blood from a capillary.
16. Blood vessels deliver oxygen-rich blood from the heart to the tissues of the body.

1. is a large vein that carries blood to the heart from other areas.
2. a small branch of an artery leads into a capillary.
3. becoming slower.
4. What kind of blood flows in the pulmonary vein and in the arteries.
7. the internal pacemaker controls the beat of the heart.
10. pair of spongy air-filled organs is located on either side of the chest.
12. what kind of blood is delivered to the heart via the superior vena cava.
15. Blood vessels that carry deoxygenated blood from tissues back to the heart.