Critical Thinking -1 Consult your notes and use the letters of the terms below t

Question

Critical Thinking -1 Consult your notes and use the letters of the terms below to put the events which occur during muscle contraction in the correct chronological order a. ADP and P, are released causing the cross-bridge to pivot and myosin slides passed actin and the muscle contracts. b. Acetylcholine depolarizes the sacrolemma of the muscle fiber, along with T tubules which are continuous with the sarcrolemma. c. Acetylcholine is released by the motor neuron d. Ca2 binds to Troponin/Tropomyosin and the myosin binding sites on actin are uncovered. e. Ca*2 is pumped back into the sarcoplasmic reticulum f. Depolarization of the T tubules causes Ca 2 to be released from the sarcoplasmic reticulum in the relaxed muscle fiber. g. If oxygen debt occurs muscle switches to anaerobic respiration of lactate. h. Initially new ATP is provided by Aerobic respiration of glucose (from glycogen) with O2 provided by myoglobin. i. Lactic acid accumulates and muscle fatigue occurs j. Myosin binds to actin forming cross-bridges. k. Myosin hydrolyzes ATP to ADP and P I. A nerve impulse from motor neuron arrives at motor end plate of the relaxed muscle fiber. m. New ATP binds to myosin causing it to release actin and the muscle returns to the relaxed state. Events of muscle contraction in chronological order:

Explanation / Answer

The chronological order of muscle contraction is as follows

1. I

2. C

3. B

4. F

5. D

6.J

7. K

8. A

9. E

10.M

11.H

12.G

13.I

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