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What are the symptoms of menopause? What is a possible problem of living with estrogen?
Transverse Tubules
These are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the uniform contraction of the muscle.
Sarcolemma
The thin, plasma membrane that envelopes a muscle cell (fiber), playing a critical role in muscle contraction.
Z Lines
Positions within muscle fibers that mark the boundaries of sarcomeres, playing a critical role in muscle contraction by anchoring actin filaments.
I Bands
The light-appearing regions of a sarcomere in striated muscle fibers, primarily composed of thin actin filaments.
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