Examlex
The ego operates through the pleasure principle.
Ability
The possession of the means or skill to do something.
Sarcoplasmic Reticulum
A specialized type of smooth endoplasmic reticulum found in muscle cells, involved in the regulation of calcium ions.
Sarcoplasm
The cytoplasm within a muscle cell, containing organelles, proteins, and the substances required for muscle contraction.
Sarcomere
The basic contractile unit of muscle fiber, consisting of actin and myosin filaments between two Z-lines in striated muscle cells.
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