06.3B3 U6P1 (PART B) Sarcomere Structure ONLY

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9 Terms

1
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Sarcomere

The functional unit of muscle that produces muscular contraction and consists of repeating sections of actin and myosin.

<p>The functional unit of muscle that produces muscular contraction and consists of repeating sections of actin and myosin.</p>
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Myofilaments

The contractile proteins, actin and myosin, that help make up the sarcomere

<p>The contractile proteins, actin and myosin, that help make up the sarcomere</p>
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Myosin

A thick contractile protein found in the sarcomere that interacts with actin to produce muscle movement

<p>A thick contractile protein found in the sarcomere that interacts with actin to produce muscle movement</p>
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Actin

A thin contractile protein found in the sarcomere that interacts with myosin to produce muscle movement

<p>A thin contractile protein found in the sarcomere that interacts with myosin to produce muscle movement</p>
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A band

The band of the sarcomere that extends the full length of the thick filament and includes regions of thick and thin filament overlap, as well as a region of thick filament only. These bands alternate with I bands to give skeletal and cardiac muscle a striated appearance and does not shorten during muscle contraction.

<p>The band of the sarcomere that extends the full length of the thick filament and includes regions of thick and thin filament overlap, as well as a region of thick filament only. These bands alternate with I bands to give skeletal and cardiac muscle a striated appearance and does not shorten during muscle contraction.</p>
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I band

The region of the sarcomere made up only of thin filaments. These bands alternate with A bands to give skeletal and cardiac muscle a striated appearance and get shorter (and may disappear completely) during muscle contraction.

<p>The region of the sarcomere made up only of thin filaments. These bands alternate with A bands to give skeletal and cardiac muscle a striated appearance and get shorter (and may disappear completely) during muscle contraction.</p>
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Z-disc

Sheet of proteins that anchor thin filaments, connect the myofibrils to one another and define the boundaries of the sarcomere

<p>Sheet of proteins that anchor thin filaments, connect the myofibrils to one another and define the boundaries of the sarcomere</p>
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H zone

The region at the center of an A band of a sarcomere that is made up of myosin only; this zone gets shorter and may disappear during muscle contraction.

<p>The region at the center of an A band of a sarcomere that is made up of myosin only; this zone gets shorter and may disappear during muscle contraction.</p>
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M line

Supporting proteins that hold the thick filaments together in the H zone

<p>Supporting proteins that hold the thick filaments together in the H zone</p>

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