Key Tetms

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Across
  1. 3. a blood vessel that carries blood away from the heart
  2. 6. a tiny blood vessel
  3. 9. the substance in the red blood cells that carries oxygen and gives blood it's red color
  4. 11. involuntary muscle contractions in the digestive system
  5. 13. a group of cells with similar functions
  6. 14. a chemical substance secreted by the endoglands into the bloodstream
  7. 16. elevated body temperature
  8. 17. groups of tissues with the same function
Down
  1. 1. organs that work together to perform special functions
  2. 2. protection against a disease or condition
  3. 4. the process of supplying the cells with oxygen and removing carbon dioxide
  4. 5. the basic unit of body structure
  5. 7. the burning of food for heat and energy by the cells
  6. 8. the heart is at rest
  7. 10. the process that breaks down food physically and chemically
  8. 12. the heart is pumping blood
  9. 15. a blood vessel that returns blood to the heart