lecture 8; skeletal muscle

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10 Terms

1
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sarcoplasm

  • cytoplasm of muscle cells

2
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sarcolemma

  • plasma membrane of muscle cells

3
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sarcoplasmic reticulum

  • ER organelle of muscle cells

  • storage sit for calcium

  • red

knowt flashcard image

<ul><li><p>ER organelle of muscle cells</p></li><li><p>storage sit for calcium</p></li><li><p>red</p></li><li><p></p></li></ul><img src="https://knowt-user-attachments.s3.amazonaws.com/f1a63c06-310a-4b34-b363-669554a21ce0.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>
4
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myofibrils

  • muscle cells/fibres contain many fibrils

  • arranged into units of contraction (sarcomere)

  • tick myosin filaments

  • thin actin filaments

  • tiny dots, with yellow nucleus on periphery

knowt flashcard image

<ul><li><p>muscle cells/fibres contain many fibrils</p></li><li><p>arranged into units of contraction (sarcomere)</p></li><li><p>tick myosin filaments </p></li><li><p>thin actin filaments </p></li><li><p>tiny dots, with yellow nucleus on periphery</p></li><li><p></p></li></ul><img src="https://knowt-user-attachments.s3.amazonaws.com/83a8a1cb-0daa-4a5a-936c-4ad0237c3c6f.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>
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neuromuscular junction

  • junction between motor neuron and muscle fibre

6
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transverse tubules

  • extend from sarcolemma to sarcoplasmic reticulum

  • extensions of plasma membrane

  • green

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<ul><li><p>extend from sarcolemma to sarcoplasmic reticulum </p></li><li><p>extensions of plasma membrane </p></li><li><p>green</p></li><li><p></p></li></ul><img src="https://knowt-user-attachments.s3.amazonaws.com/f1ce087b-4d81-4fb3-91e1-fe3fa24438c1.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>
7
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skeletal muscle and connective tissue relationship

  • Endomysium

    • Surrounds individual muscle fibres

  • Perimysium

    • Surrounds bundles of muscle fibres (fascicles)

  • Epimysium

    • Surrounds entire muscle

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<ul><li><p><span>Endomysium</span></p><ul><li><p><span>Surrounds individual muscle fibres</span></p></li></ul></li></ul><ul><li><p><span>Perimysium</span></p><ul><li><p><span>Surrounds bundles of muscle fibres (fascicles)</span></p></li></ul></li></ul><ul><li><p><span>Epimysium</span></p><ul><li><p><span>Surrounds entire muscle</span></p></li></ul></li></ul><img src="https://knowt-user-attachments.s3.amazonaws.com/db03e1af-380e-417d-9472-419cb89d0745.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p><p></p>
8
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skeletal muscle in tongue

  • crisscrossed fibres

  • makes the tongue really strong

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<ul><li><p>crisscrossed fibres </p></li><li><p>makes the tongue really strong </p></li></ul><p></p><img src="https://knowt-user-attachments.s3.amazonaws.com/80737ecf-5b96-499f-b4f0-cb7c9c5dbf48.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>
9
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transmission electromicrograph of skeletal muscle

  • dark grey= mitochondria

  • white = endomysium (loose connective tissue)

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<ul><li><p>dark grey= mitochondria </p></li><li><p>white = endomysium (loose connective tissue) </p></li></ul><img src="https://knowt-user-attachments.s3.amazonaws.com/f3b932ec-f050-463f-a040-2cbc42f96e8c.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p><p></p>
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striations and sarcomeres

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<img src="https://knowt-user-attachments.s3.amazonaws.com/a54db664-f1c1-4d7d-b868-fa7210b5af49.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>