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