Lecture #3 (sarcomere)

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Last updated 6:38 PM on 4/5/26
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11 Terms

1
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Define sarcomere

a contractile unit of skeletal muscle

2
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A sarcomere is the region between what 2 lines/discs?

Z lines or Z discs

3
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Does the sarcomere pattern repeat over and over throughout the myofibril?

Yes

4
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What is the M-line?

the middle section of a thick filament; marks the "middle" of a sarcomere

5
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Where in the sarcomere is the A-Band?

areas in a myofibril that contains BOTH overlapping thin actin and thick myosin filaments

6
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Where in the sarcomere is the I-Band?

areas in a myofibril that contains thin actin filaments

7
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Which one of these bands is the "dark" band and which is the "light" band?

I-band = light band

A-band = dark band

8
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Why is the I-band light?

contains thin filament only

9
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Why is the A-band dark?

thick and thin filaments overlap

10
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Where in the sarcomere can you find the H-band/zone?

region of an A band that contains thick myosin filaments but NO overlapping thin actin filaments

11
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What is connectin (another name for this is titin)?

anchors the thick filament to the Z line/disc