Examlex
Which of the following is considered to be a normal constituent of urine?
Perimysium
A sheath of connective tissue that groups muscle fibers into bundles or fascicles within a muscle.
Endomysium
A thin layer of connective tissue that surrounds each individual muscle fiber, providing support and maintaining the spatial organization of muscle fibers.
Myofilaments
The filamentous components of muscles, comprising mainly of actin (thin filaments) and myosin (thick filaments), essential for muscle contraction.
Sarcoplasmic Reticulum
A specialized type of smooth endoplasmic reticulum found in muscle fibers, critical in regulating calcium ions and thus muscle contraction.
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