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1?
Myelin sheath surrounding axon of motor neuron

2?
Axon terminal

3?
Synaptic end bulb at the neuromuscular junction

4?
Myofibril of muscle fiber

5?
Sarcoplasm

6?
Synaptic end bulb

7?
Nerve impulse (action potential)

8?
Synaptic vesicle

9?
Sarcolemma

10?
Synaptic cleft

11?
Motor end-plate

12?
ACh

13?
Synaptic vesicle

14?
Synaptic cleft

15?
ACh receptor

16?
Motor end-plate

17?
Synaptic vesicle releases ACh by exocytosis

18?
Binding of ACh to its receptor opens the channel

19?
Sarcolemma

1?
Nucleus

2?
Muscle fiber

3?
Light I band

4?
Mitochondrion

5?
Sarcolemma

6?
Myofibril

7?
Dark A band

8?
Sarcoplasmic reticulum

9?
Thin (actin) filament

10?
Z disc

11?
Sarcomere

12?
H zone

13?
Z disc

14?
Thick (myosin) filament

15?
I band

16?
A band

17?
I band

18?
M line

1?
Skeletal muscle

2?
Epimysium

3?
Muscle fascicles

4?
Muscle fascicle

5?
Perimysium

6?
Endomysium

7?
Muscle fibers

8?
Muscle fiber

9?
Sarcolemma

1?
Sarcolemma

2?
Sarcoplasmic reticulum

3?
Terminal cisternae

4?
T-tubule

5?
Triad

1?
Sarcomere

2?
H zone

3?
M line

4?
Z line

5?
Lighter I band

6?
Darker A band

7?
Portion of thick filament

8?
Portion of a thin filament

9?
Troponin

10?
Actin

11?
Tropomyosin

12?
Head

13?
Actin-binding sites

14?
ATP-binding site

15?
Heads

16?
Tail

17?
Myosin molecule

18?
Flexible hinge region

19?
Binding site for myosin

20?
Actin subunits

1?
An action potential arrives at neuromuscular junction

2?
ACh is released, binds to receptors, and opens sodium ion channels, leading to an action potential in sarcolemma

3?
Action potential travels along the T-tubules

4?
Calcium

5?
Troponin

6?
Thick and thin filament interaction leads to muscle contraction

7?
Muscle shortens and produces tension

What is this describing?
Contraction of muscle fiber

1?
Calcium

2?
Calcium is resorbed, beginning relaxation cycle; ATP is required

3?
Thick and thin filament interaction relaxes

4?
Muscle lengthens and relaxes

What is this describing?
Relaxation of a muscle fiber

1?
Calcium

2?
Actin

3?
Myosin head

4?
Thin filament

5?
Crossbridge

6?
Thick filament

7?
Power stroke

8?
ADP and Pi released

9?
ATP attaches to myosin and myosin head detaches

10?
Cocking of myosin head

11?
Actin

12?
Thin filament

13?
Calcium binding

14?
Myosin head

15?
Thick filament

1?
M line