Rank the sequence of the sliding filament theory in the correct order. Begin wit

Question

Rank the sequence of the sliding filament theory in the correct order. Begin with depolarization of the muscle.

This step involves the movement of calcium in the sarcoplasmic reticulum against its chemical gradient

ATP is used in this step, which ultimately ends with re-energizing the thick filament

The powerstroke occurs

myosin head binds to actin

the actin binding sites for actin are exposed

The cross bridge disconnects

Step 3

Final step

Step 5

Step 1

Step 4

Step 2

-a.b.c.d.e.f.

This step involves the movement of calcium in the sarcoplasmic reticulum against its chemical gradient

-a.b.c.d.e.f.

ATP is used in this step, which ultimately ends with re-energizing the thick filament

-a.b.c.d.e.f.

The powerstroke occurs

-a.b.c.d.e.f.

myosin head binds to actin

-a.b.c.d.e.f.

the actin binding sites for actin are exposed

-a.b.c.d.e.f.

The cross bridge disconnects

a.

Step 3

b.

Final step

c.

Step 5

d.

Step 1

e.

Step 4

f.

Step 2

Explanation / Answer

STEP 1 :This step involves the movement of calcium in the sarcoplasmic reticulum against its chemical gradient

STEP 2 In the presence of high concentrations of Ca+, the Ca+ binds to Troponin, changing its shape and so moving Tropomyosin from the active site of the Actin. The Myosin filaments can now attach to the Actin, myosin head binds to actinmyosin heads to bind to these exposed binding sites and form cross-bridges.

STEP3:: the actin binding sites for actin are exposed.

STEP 4 :power stroke

STEP 5: cross bridges broken

STEP 6 : ATP is used in this step, which ultimately ends with re-energizing the thick filament

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