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Sliding filament Theory

Draw a line from each item on the left to its match on the right.

1. 1

2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. 8

9. 9

10. 10

A. Myosin binds to actin causing a power stroke

B. ATPase breaks down ATP

C. Depolarization of the sarcolemma

D. Calcium binds to troponin C, causing tropomyosin to open binding sites in actin

E. Calcium is pumped out of the muscle, repolarization occurs

F. Myosin head releases from actin

G. Opening of the NA and K channels causing a depolarization wave down the neuron

H. Calcium is released from the SR into the muscle

I. Initial depolarization of the neuron

J. Release of AcH across the synaptic cleft, binds to muscle receptors

Answer Key

1. 1 → I. Initial depolarization of the neuron

2. 2 → G. Opening of the NA and K channels causing a depolarization wave down the neuron

3. 3 → J. Release of AcH across the synaptic cleft, binds to muscle receptors

4. 4 → C. Depolarization of the sarcolemma

5. 5 → H. Calcium is released from the SR into the muscle

6. 6 → D. Calcium binds to troponin C, causing tropomyosin to open binding sites in actin

7. 7 → A. Myosin binds to actin causing a power stroke

8. 8 → B. ATPase breaks down ATP

9. 9 → F. Myosin head releases from actin

10. 10 → E. Calcium is pumped out of the muscle, repolarization occurs