The Circulatory System

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Across
  1. 4. Flat discs that do not contain nuclei.
  2. 8. A thin membrane lines the inside of the heart
  3. 10. The exchange of substances happen between the blood in the capillaries and cells.
  4. 12. Larger than erythrocytes and do not have a fixed shape.
  5. 13. Removal of carbon dioxide
Down
  1. 1. Largest Artery in the Body
  2. 2. The heart is divided into a left and right half by a strong muscular wall
  3. 3. Carry blood away from the heart
  4. 5. All the changes that occur in the heart during one heartbeat.
  5. 6. Carry blood to the heart
  6. 7. These are small biconcave discs that do not contain nuclei
  7. 9. Oxygen-Carrying Molecule in Blood
  8. 11. Upper Heart Chamber