VE heart embryo

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Across
  1. 2. a mature egg
  2. 4. this circulation starts from the left side of the heart and carries oxygenated blood to the tissues
  3. 5. the outermost of the three germ layers
  4. 7. breastbone
  5. 8. chamber of the heart receiving blood from an atrium
  6. 9. become shorter or tighter (used of muscles)
  7. 10. the natural pacemaker of the heart, it causes the heart to beat
  8. 15. dividing wall between the right and left sides of the heart
  9. 16. the process by which the blastocyst is embedded in the endometrium
  10. 17. a cluster of cells without a cavity, formed from the zygote
  11. 18. lining of the uterus
Down
  1. 1. this circulation carries deoxygenated blood to the lungs
  2. 3. heart muscle
  3. 6. double-layered membrane surrounding the heart
  4. 11. the process by which the zygote becomes a morula
  5. 12. become longer (used of muscles)
  6. 13. pertaining to the fetus
  7. 14. chamber of the heart receiving blood from the main veins