Muscle Cell Labeling Flashcards

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.

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.