Organization of Skeletal Muscle Flashcards
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Questions and Answers

What is a sarcomere?

A structural unit of a myofibril in striated muscle, the basic unit of a muscle.

What does the epimysium do?

Covers the muscle and separates it from neighboring structures.

What is the function of the perimysium?

It surrounds a bundle of muscle fibers.

What does the endomysium surround?

<p>Each muscle fiber (cell).</p> Signup and view all the answers

What are myofibrils?

<p>Elongated contractile threads found in striated muscle cells.</p> Signup and view all the answers

What are striations?

<p>Muscle tissue that have repeating sarcomeres.</p> Signup and view all the answers

What is the sarcolemma?

<p>The cell membrane of a muscle fiber.</p> Signup and view all the answers

What is the transverse tubule?

<p>A deep invagination of the sarcolemma.</p> Signup and view all the answers

What is the function of the sarcoplasmic reticulum?

<p>Regulates calcium ion concentration in the cytoplasm of striated muscle cells.</p> Signup and view all the answers

What are actin filaments?

<p>Thin filaments made of protein.</p> Signup and view all the answers

What are myosin filaments?

<p>Thick filaments made of protein.</p> Signup and view all the answers

What is a fascicle?

<p>Muscle fibers divided into groups.</p> Signup and view all the answers

Study Notes

Organization of Skeletal Muscle

  • Sarcomere: Basic unit of striated muscle, essential for muscle contraction, comprising repeating contractile units.
  • Epimysium: Layer of collagenous connective tissue enveloping the entire muscle, providing structural support and separating it from surrounding tissues.
  • Perimysium: Connective tissue sheath surrounding muscle fiber bundles (fascicles), facilitating blood flow and nerve distribution.
  • Endomysium: Connective tissue that extends from the perimysium, encasing individual muscle fibers, aiding nutrition and signaling.
  • Myofibril: Elongated contractile threads within striated muscle cells, composed of repeating sarcomeres responsible for muscle contraction.
  • Striations: Characteristic bands in skeletal muscle tissue resulting from the arrangement of myofibrils and sarcomeres, indicating the presence of contractile proteins.
  • Sarcolemma: Cell membrane of muscle fibers, essential for action potential propagation and maintaining the internal environment of the muscle cell.
  • Transverse Tubule: Invaginations of the sarcolemma that penetrate deep into the muscle fiber, facilitating the spread of electrical impulses and ensuring synchronous contraction.
  • Sarcoplasmic Reticulum: Specialized form of smooth endoplasmic reticulum in striated muscle cells that regulates calcium ion levels, crucial for muscle contraction and relaxation.
  • Actin: Protein that forms thin filaments in muscle contraction; interacts with myosin to facilitate movement.
  • Myosin: Protein forming thick filaments, playing a key role in muscle contraction by binding to actin filaments and pulling them together.
  • Fascicle: Groups of muscle fibers, organized to enhance muscle function, with multiple fascicles comprising a single muscle.

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Test your knowledge on the organization of skeletal muscle with these flashcards. Each card presents a key term related to muscle anatomy, such as sarcomere, epimysium, and more. Perfect for students of anatomy and physiology!

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