Definition

1. Noun:
   • The cytoplasm of a striated muscle fiber: Sarcoplasm is the specialized, gel-like substance that fills the interior of a muscle cell (fiber), surrounding the myofibrils. It contains organelles like mitochondria and sarcoplasmic reticulum, as well as dissolved ions, glycogen, and myoglobin.

Usage Examples

• Noun:
  • The sarcoplasm contains high concentrations of potassium and glycogen to fuel muscle contractions.
  • Under the microscope, the sarcoplasm appears as the clear area between the dark, thread-like myofibrils.
  • Calcium ions are released from stores within the sarcoplasm to initiate muscle movement.

Advanced Usage

• "Sarcoplasmic reticulum": This is a specialized network of membranes within the sarcoplasm that stores and releases calcium ions, which are crucial for muscle contraction. It is a distinct organelle contained the sarcoplasm.
  • The sarcoplasmic reticulum is an adaptation of the endoplasmic reticulum found in muscle cells.

Variants and Related Words

• Sarcoplasmic (adj): Of or relating to the sarcoplasm.
  • The sarcoplasmic viscosity can change during exercise.

Synonyms

• Muscle cell cytoplasm: A more general descriptive term.
• Intracellular fluid (of a muscle fiber): Refers to the fluid component within the muscle cell membrane (sarcolemma).

Noun

1. the cytoplasm of a striated muscle fiber