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Not including H-bands, titin, thick filaments, thin filaments

A-band

What structure is indicated by yellow box structure?

M-line

What does the arrow point to?

I-band

What is B?

A band

The dark areas of a myofibril that corresponds to the areas where thick filaments are present

I band

The light areas of a myofibril that contain only thin filaments

Z line

A protein disk within the I band that anchors the thin filaments

H-zone

What is A?

Z-line

What does arrow point to?

Sarcomere

What is C?

H-zone

Center of A band that contains only the thick filament

M-line

Region in center of H zone that holds thick filaments together at center of sarcomere

Actin

Protein that makes up thin filaments

Myosin

Protein that makes up thick filaments

Actin

What is labeled with a letter A?

Myosin

What is labeled with a letter B?

Sarcomere

the segment of a myofibril that is the unit of contraction, extending from one z line to the next z line

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