1. depolarization repolarization unpolarization polarization none of the above

2. calcium acetyl choline ATP myosin ACh-E oxygen carbon dioxide none of the above

3. sarcoplasmic reticulum motor end plate t-tubules motor neuron none of the above

4. Calcium Acetyl Choline ATP Myosin ACh-E Oxygen Carbon Dioxide none of the above

5. active transport osmosis diffusion telepathy none of the above

6. oxygen sugar glucose ATP none of the above

7. sarcoplasmic reticulum motor end plate t-tubules motor neuron none of the above

8. arcoplasm actin myosin carbohydrate lipid none of the above

9. A-lines D-lines F-lines Z-lines none of the above

10. D-Zone H-zone actin myosin none of the above

Muscle cell (1) (relaxation) begins when (2) decomposes the ACh-receptor complexes located at the (3). (4) ions move by (5) (an event which requires (6)) from the troponin and tropomyosin back into the (7). The troponin and tropomyosin molecules then cover the myosin binding sites on the (8) molecules and the sarcomere moves back to its relaxed state - (9) move farther apart and the (10) becomes larger.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

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2.

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5.

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10.