heart crossword

2. any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.
4. what controls were blood can and can't flow into
5. any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.
6. another term for myocardium.
7. the main artery of the body, supplying oxygenated blood to the circulatory system. In humans it passes over the heart from the left ventricle and runs down in front of the backbone.
8. something that tells the heart when to beat
9. the upper chamber of the heart
10. a partition separating two chambers, such as that between the nostrils or the chambers of the heart.

1. the lower chamber of the heart
3. a large vein carrying deoxygenated blood into the heart.
6. the fine branching blood vessels that form a network between the arterioles and venules.