Sarcoplasm
Sarcoplasm
Sarcoplasm (/sɑːrˈkɒplæzəm/; from the Greek sarx meaning "flesh", and plasma meaning "something formed or molded") is the cytoplasm of a muscle fiber. It is comparable to the cytoplasm in other cells, but it houses uniquely large amounts of glycogen fuel and myoglobin, a special oxygen-binding molecule.
Etymology
The term "sarcoplasm" is derived from the Greek words sarx, which means "flesh", and plasma, which means "something formed or molded". This term was first used in the late 19th century to describe the unique substance found within muscle fibers.
Function
The primary function of the sarcoplasm is to provide a supportive framework for the cellular components and to facilitate cellular processes. It contains large amounts of glycogen which provides energy for muscle contraction and myoglobin, an oxygen-binding molecule that ensures a steady supply of oxygen for the metabolic processes of the cell.
Related Terms
- Myofibril: A basic rod-like unit of a muscle cell. Muscles are composed of tubular cells called myocytes, known as muscle fibers in striated muscle, and these cells in turn contain many chains of myofibrils.
- Sarcolemma: The fine transparent tubular sheath that envelops the fibers of skeletal muscles.
- Sarcoplasmic Reticulum: A specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.
See Also
External links
- Medical encyclopedia article on Sarcoplasm
- Wikipedia's article - Sarcoplasm
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