Network of internal membranes in the cytoplasm of a muscle cell that contains high concentrations of sequestered Ca2+ that is released into the cytosol during muscle excitation.
Network of membranes, derived from the smooth endoplasmic reticulum, that surrounds each myofibril in a muscle cell and sequesters Ca2+ ions. Depolarization (stimulation) of a muscle cell induces release of Ca2+ ions into the cytosol, triggering coordinated contraction along the length of the cell. Endoplasmic reticulum in muscle fiber ; site of storage and release of calcium ions.
Smooth endoplasmic reticulum of muscle fibres; calcium store, which is released and sequestered during and after contractions.
An intracellular store of calcium ions wrapped around the contractile apparatus of myofibrils in striated muscle cells. Calcium released from the sarcoplasmic reticulum triggers contraction.
a network of saccules and tubes surrounding the myofibrils of a muscle fiber (cell), comparable to endoplasmic reticulum; functions to reabsorb calcium ions during relaxation and to release them to cause contraction
A membrane structure within the cell which stores calcium, and regulates the release of calcium into the space. It effectively acts as a store of caclium, and allows rapid released of calcium into the cell to allow contraction. Close this window
is found in striated skeletal muscle and envelops the myofibrils and is important as an intracellular store of Ca2
(sawr'-ko-PLAHZ-mihk reh-TIHK-yoo-luhm) A cellular organelle found only in muscle cells that stores calcium ions, and is similar in structure to the endoplasmic reticulum found in other cells.
membrane system in cardiac muscle cells analogous to the endoplasmic reticulum of other cells; calcium ions that act as a trigger for muscle contraction are stored in these structures when the cell is resting.
a network of membranous tubules that surrounds each myofibril in a skeletal muscle cell. It sequesters and then releases the calcium ions that trigger muscle contraction.
(SR)- A smooth, membrane-limited network surrounding each myofibril. Calcium is stored in the SR and released as free Calcium during muscle excitation-contraction coupling.
network of intracellular cavities that plays an important role in protein synthesis.
Endoplasmic reticulum of striated muscle, specialized for the sequestration of calcium ions that are released upon receipt of a signal relayed by the T-tubules from the neuromuscular junction.
In striated muscle, sarcoplasmic reticulum is a type of smooth endoplasmic reticulum specially adapted to surround the myofibrils, forming dyads in cardiac muscle and triads in skeletal muscle with invaginations of the plasma membrane called T-tubules.