Muscle Contraction

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Across
  1. 1. an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve.
  2. 4. adenosine triphosphate is a complex organic chemical that provides energy to drive many processes in living cell
  3. 6. the fine transpired tubular sheath which envelops the fibers of skeletal muscle cells
  4. 7. consist primarily of the protein myosin. Each actin has an active site that can bind to the head of a myosin molecule.
  5. 11. also known as adenosine pyrophosphate, is an important organic compound in metabolism and is essential to the flow of energy in living cells.
  6. 12. a compound which occurs throughout the nervous system, in which it functions as a neurotransmitter.
  7. 13. one of the segments into which a myofibril is divided
  8. 14. the space between neurons at a nerve impulse is transmitted by a neurotransmitter
  9. 16. it is a principal component of a person's internal environment—the extracellular fluid.
  10. 17. a neuron conducting impulses outwards from the brain or spinal cord
  11. 18. a protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cells
  12. 19. an elongated contractile cell that forms the muscles of the body
Down
  1. 2. a polymer of actin with tightly bound regulatory proteins troponin and tropomyosin
  2. 3. is a membrane-bound structure found within the muscle cells that is similar to the endoplasmic reticulum in other cells.
  3. 5. three regulatory proteins that is integral to muscle contraction in skeletal muscle and cardiac muscle but not smooth muscle
  4. 8. extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells
  5. 9. the local voltage change across the cell wall as a nerve impulse is transmitted.
  6. 10. a white metallic element that burns with a brilliant light
  7. 15. a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells.
  8. 20. the calcium is like a "key" which fits into the lock of a door (troponin)