Science

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Across
  1. 3. exchange The process of taking in oxygen and releasing carbon dioxide.
  2. 6. The process where a single cell divides resulting in generally two identical cells, each containing the same number of chromosomes and genetic content as that of the original cell.
  3. 8. Tiny blood vessels that play an important role in gas exchange.
  4. 9. The process by which nutrients diffuse or are moved from the digestive system to the blood.
  5. 11. The stage in the cell cycle when then cytoplasm and organelles divide into two identical, separate cells.
  6. 14. The third phase of mitosis, when the chromosomes separate and move to opposite ends of the cell.
  7. 15. The ability to grow new cells to replace damaged or lost body components.
  8. 18. The movement of molecules or other particles from an area of high concentration to an area of low concentration until they are evenly distributed.
  9. 19. Specialized cells working together to perform a function; the four major types of human tissue are muscle tissue, connection tissue, nervous tissue, and epithelial tissue.
Down
  1. 1. Literally, the term means "little organs".
  2. 2. Air sacs in the lungs where gas exchange occurs.
  3. 4. The first phase of mitosis, when the nucleus and nuclear membrane disappear and chromosomes form.
  4. 5. The movement of water molecules across a membrane in response to concentration differences.
  5. 7. The stage in the cell cycle when a cell grows and carries out its usual functions, as well as making a copy of its DNA and organelles to prepare for cell division.
  6. 8. The number of molecules of a substance in a given volume.
  7. 10. blood cells Blood cells that carry oxygen and carbon dioxide in the blood.
  8. 12. Cycle The sequence of growth and division of a cell; consists of Interphase.
  9. 13. The second phase of mitosis, when the chromosomes align on the centre of the cell.
  10. 16. The fourth phase of mitosis, when the membrane surrounding the nucleus re-forms, creating two new nuclei.
  11. 17. Different tissues working together to perform a specific task; connective, nervous, and epithelial tissues make up the brains.