Questions and Answers
What is the definition of a tendon?
What is the definition of epimysium?
What is the definition of endomysium?
What is the definition of muscle fiber (cell)?
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What is the definition of perimysium?
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What is the definition of muscle fascicle?
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What is the definition of nucleus?
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What is the definition of sarcolemma?
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What is the definition of myofibril?
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What is the definition of thin filament?
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What is the definition of thick filament?
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What is the definition of sarcoplasm?
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What is the definition of sacromere?
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What is the definition of actin?
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What is the definition of troponin?
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What is the definition of active site?
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What is the definition of tropomyosin?
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What is the definition of myosin head?
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Study Notes
Muscle Cell Structure and Components
- Tendon: Connects muscle to bone, facilitating movement.
- Epimysium: The outer layer of connective tissue surrounding an entire muscle.
- Perimysium: Connective tissue that groups muscle fibers into fascicles.
- Endomysium: A delicate connective tissue sheath surrounding individual muscle fibers.
Muscle Fiber Types
- Muscle Fiber (Cell): The basic unit of muscle, capable of contraction.
- Muscle Fascicle: A bundle of skeletal muscle fibers grouped together.
- Muscle Fascicles: Several muscle fascicles make up a whole muscle, influencing strength and control.
Structural Proteins in Muscle
- Myofibril: Rod-like unit within muscle fibers composed of sarcomeres.
- Thin Filament: Primarily made of actin, along with troponin and tropomyosin.
- Thick Filament: Composed mainly of myosin, featuring myosin heads for contraction.
Sarcomere and Its Role
- Sarcomere: The structural and functional unit of muscle, extending from Z-line to Z-line.
- Z-line: The boundary between adjacent sarcomeres, anchoring filaments.
Functions of Muscle Proteins
- Actin: Forms the core of thin filaments, interacting with myosin during contraction.
- Troponin: A regulatory protein that binds calcium, initiating muscle contraction.
- Tropomyosin: Covers active sites on actin, preventing myosin binding when muscles are relaxed.
- Myosin Head: Binds to actin during contraction, facilitating muscle shortening.
Cytoplasmic Components
- Sarcoplasm: The cytoplasm of muscle cells, rich in organelles and myofibrils.
- Nucleus: Contains genetic material and is crucial for cellular function.
Various Filament Dynamics
- Myofibrils: Multiple myofibrils within a muscle fiber contribute to overall muscle contraction.
- Active Site: The location on actin that binds to myosin heads during contraction.
Summary of Muscle Type
- Skeletal Muscle: Striated muscle controlled voluntarily, essential for movement and stability.
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Description
Test your knowledge on muscle cell anatomy with this labeling flashcard quiz. Each card presents a terminology related to muscle fibers, including definitions for key components like tendons and various layers of muscle tissue. Perfect for students studying anatomy or physiology.
