Question 12 0 out of 2 points Put the following steps in E-C coupling in order.

Question

Question 12 0 out of 2 points Put the following steps in E-C coupling in order. Start with ATP binds to myosin. Answers Selected Answer myosin releases ADP 1. ATP binds to myosin Myosin releases inorganic phosphate and the myosin swivels, allowing the actin filament to move toward the M line myosin affinity for actin decreases, and myosin releases actin ATP binds to myosirn 3. Myosin releases inorganic phosphate and the myosin swivels, allowing the actin filament to move toward the M line myosin affinity for actin decreases, and myosin releases actin Myosin breaks ATP into ADP and inorganic phosphate 5. The energy from ATP hydrolysis causes the myosin head to rotate to a cocked position and bind weakly to actin Myosin breaks ATP into ADP and inorganic phosphate The energy from ATP hydrolysis causes the myosin head to rotate to a cocked position and bind weakly to actin 6. myosin releases ADP

Explanation / Answer

Q 12:

1. ATP binds to myosin

2. Myosin breaks ATP into ADP and inorganic phosphate

3. Myosin releases ADP

4. Myosin releases inorganic phosphate and myosin swivels, allowing the actin filament to move toward the M line

5. The energy from ATP hydrolysis causes the myosin head to rotate to a cocked position and bind weakly to actin

6. Myosin affinity for actin decreases and myosin releases actin

Q 13:

1. Calcium unbinds from troponin

2. Calcium is actively transported into the sarcoplasmic reticulum

3. The cytosolic concentration of /calcium decreases

4. when myosin releases actin, it is not able to form cross bridges again

5. tropomyosin blocks actin-myosin binding sites

6. elastic fibers in the sarcomere and mucle connective tissue pull the muscle fibers that lack crossbridges back t their relaxe

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