Podcast
Questions and Answers
Which zone is NOT a part of the sarcomere?
Which zone is NOT a part of the sarcomere?
The H zone contains both myosin and actin filaments.
The H zone contains both myosin and actin filaments.
False
What is the distance between two Z lines called?
What is the distance between two Z lines called?
sarcomere
The dark bands are called A bands, while the light bands are called _____ bands.
The dark bands are called A bands, while the light bands are called _____ bands.
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Match the following muscle structural components with their descriptions:
Match the following muscle structural components with their descriptions:
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Which type of muscle tissue is under voluntary control?
Which type of muscle tissue is under voluntary control?
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The sarcoplasm contains contractile elements called myofibrils.
The sarcoplasm contains contractile elements called myofibrils.
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What is the cell membrane of muscle fibers called?
What is the cell membrane of muscle fibers called?
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The connective tissue surrounding a whole muscle is known as the ______.
The connective tissue surrounding a whole muscle is known as the ______.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Study Notes
Muscular Tissue
- Muscle tissue is composed of elongated cells called muscle fibers.
- The cell membrane is called sarcolemma, and the cytoplasm is sarcoplasm.
- Myofibrils are contractile elements within the sarcoplasm.
- Three types of muscle tissue exist: skeletal, cardiac, and smooth.
Skeletal Muscle
- Skeletal muscles are attached to the skeleton, enabling body movement.
- They are striated (have transverse bands), and voluntary (under our conscious control).
Gross Structure of Muscle and Surrounding Connective Tissue
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Whole Muscle: Composed of multiple muscle fascicles enveloped by epimysium (a connective tissue sheath).
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Muscle Fascicle: Bundles of individual muscle fibers surrounded by perimysium (a thinner connective tissue sheath).
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Muscle Fibers: Individual muscle cells, typically long, enclosed by sarcolemma and surrounded by endomysium which contains capillaries and nerves to supply each fiber.
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Myofibrils are long functional units within a muscle fiber, containing myofilaments (actin and myosin).
Light Microscopic Structure of Skeletal Muscle
- Skeletal muscle fibers are elongated and vary in length.
- They are multinucleated, with nuclei oval-shaped and situated under the sarcolemma
- The sarcoplasm is deeply acidophilic (staining dark) and shows cross-striations.
- Myofibrils are longitudinal and cylindrical, parallel to each other within a muscle fiber.
Sarcomere
- The sarcomere is the structural and functional unit of the skeletal muscle fiber.
- It's the distance between two Z lines.
- It contains thin filaments (actin) and thick filaments (myosin).
- The A band contains both thick and thin filaments.
- The I band consists of thin filaments only.
- The H zone is the central part of the A band, where only thick filaments are present.
Electron Microscopic Structure (EM)
- The sarcoplasm contains longitudinal myofibrils, numerous mitochondria, and a well-developed sarcoplasmic reticulum.
- Myofibrils show alternating dark (A bands) and light (I bands) transverse bands, creating the striations.
Quizzes
Multiple Choice
- (1)* What zones form the sarcomere?
- A complete A band and two halves of an I band.
- (2)* Which connective tissue surrounds the whole skeletal muscle?
- Epimysium
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Description
Explore the fundamental aspects of muscular tissue, including its composition, types, and structural organization. This quiz covers details about skeletal, cardiac, and smooth muscle, as well as the connective tissues that surround them. Test your knowledge on muscle fibers and their functionality.
