The Heart

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Across
  1. 2. A structure that temporarily closes to allow movement of blood in only one direction.
  2. 6. A blood vessel that returns blood to the heart.
  3. 8. An upper chamber of the heart that receives blood.
  4. 9. The _______ system is responsible for carrying oxygen and nutrients to the body and carrying away carbon dioxide and other wastes; composed of the heart, blood vessels, and blood.
  5. 11. The ____ Vena Cava a vein that returns blood to the heart from the upper half of the body.
Down
  1. 1. This type of circulation moves blood between the heart and the body's cells to deliver oxygen.
  2. 3. A lower chamber of the heart that pumps blood out of heart.
  3. 4. The ____ Vena Cava is a vein that returns blood to the heart from the lower parts of the body.
  4. 5. This type of circulation moves blood between the heart and lungs so that it can be re-oxygenated.
  5. 7. The smallest structural unit of life capable of functioning independently.
  6. 8. A blood vessel that carries blood away from the heart.
  7. 10. The large artery that carries blood from the heart to the body.