Examlex
What are cap and trade programs? Are these a good idea? Why or why not?
Sarcoplasmic Reticulum
A network of membrane-enclosed tubules in muscle cells that stores and releases calcium ions, critical for muscle contraction.
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.
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