Anatomy of a Sarcomere

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14 Terms

1
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What can muscles do?

Contract & Relax

2
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What happens when something contracts?

It shortens

3
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What is myosin

Thick myofilament

4
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What does myosin have?

“Heads” to bind to actin

5
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What is actin?

Thin Myofilament

6
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What is actin known as?

“Two strands of pearls”

7
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What is the Z-line?

Boundary between sarcomeres

8
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What is the M-line?

“middle line”

9
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What does the M-line do?

Holds together the myosin Myofilaments

10
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What are I-bands?

Light bands

11
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What do I-bands contain?

Contains only thin (actin) filaments

12
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What does the H-zone contain?

Only thick (myosin) filaments

13
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What is the A-band?

Dark band

14
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What does the A-band contain?

The entire length of a thick (myosin) filament