skeletal muscle structure and function Flashcards by Alyssa KARLBERG

Q

What is skeletal muscle also known as?

A

Striped or striated muscle

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Q

What does muscle under a microscope consist of?

A

Long muscle fibres or cells

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Q

What is the shape of muscle fibre?

A

Cylindrical

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Q

What are muscle fibres enclosed by?

A

A cell surface membrane or sarcolemma

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Q

What do muscle fibres contain?

A

Many nuclei/ multinucleate

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Q

What are the protein strands called inside muscle fibres?

A

Myofibrils

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Q

How are muscle fibres arranged?

A

In parallel to give a striped appearance

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Q

What are the protein filaments called?

A

Myosin and actin

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Q

What is each repeating pattern called?

A

Sarcomere

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Q

What are the thick filaments?

A

Myosin

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Q

What are the thin filaments?

A

Actin

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Q

What is the A band or dark band?

A

The length of myosin filaments

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Q

Why are the outer regions of the A band dark?

A

They contain overlapping myosin and actin

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Q

What is the H zone?

A

It only contains myosin filament

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Q

What is the M line?

A

Connects the myosin filaments in the A band

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Q

What does the I band/ light band contain?

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A

Only actin filaments

Q

What does the Z line connect?

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A

Actin filaments on the boundary of the sarcomere