Review Part 2

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Across
  1. 5. Unnatural or premature cell death
  2. 6. Organelles responsible for substance transport
  3. 7. Do not change length during skeletal muscle contraction
  4. 9. Muscle fibers optimized for aerobic metabolism
  5. 11. Most bones form by this process
  6. 13. Uppermost part of sternum
  7. 14. Chemical signal
  8. 17. The cell membrane is composed of 2 _________ layers
  9. 19. A characteristic of living things; relates to the ability to adjust
  10. 20. “out of a cell” ; method for bulk expulsion of substances
  11. 22. Portion of bone where longitudinal growth occurs
  12. 23. Changing the number of neutrons results in this
Down
  1. 1. Joint with space; most joints in the limbs are this type
  2. 2. Neurotransmitter for skeletal muscle contraction
  3. 3. Electrons in outer shell of sodium atom
  4. 4. Type of tissue that covers body surfaces, lines cavities, & forms glands
  5. 8. Energy currency
  6. 10. Cell distribution center
  7. 12. Fixed joint allowing no movement; sutures are an example
  8. 15. Tough, fibrous membrane the covers most of long bone
  9. 16. Medial bone of lower leg; weight-bearing
  10. 18. The elbow or the knee
  11. 19. A neuron can have many dendrites but only one of this
  12. 21. Voluntary, striated muscle tissue that fatigues