The transverse (T) tubules are structures in a muscle cell's membrane that deliver signals from the cell surface to the sarcomeres, which are the contractile units of the muscle cell. These T-tubules help coordinate muscle contraction by allowing the signal for muscle contraction to penetrate deeply into the cell.
This is a structure found in skeletal muscle cells known as a triad. It consists of two terminal cisternae (enlarged regions of the sarcoplasmic reticulum that store and release calcium ions) and a T-tubule (invagination of the sarcolemma that helps transmit action potentials deep into the muscle cell). The triad plays a crucial role in excitation-contraction coupling, where the action potential triggers the release of calcium ions for muscle contraction.
The membrane action potential triggers the release of calcium ions from the sarcoplasmic reticulum through a process called excitation-contraction coupling. This is mediated by the protein complex known as the ryanodine receptor, which allows calcium to flow out of the sarcoplasmic reticulum and into the cytoplasm upon stimulation by the action potential.
A tube formed by the inward extension of the cell membrane is called a pseudopod. This structure is used by cells for processes such as engulfing particles or migrating.
It is the process that no one understands it.
Triad
I believe the T-Tubule
Two terminal cisternae and a T-tubule
transverse (T) tubule
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A T-tubule is a small, tube-like invagination of the cell membrane in muscle cells, particularly in cardiac and skeletal muscle. T-tubules help to transmit action potentials quickly into the cell interior, allowing for synchronous contraction of muscle fibers.
In skeletal muscle, a triad is formed when a T-Tubule is flanked on either side by the calcium containing Terminal Cisternae of the Sarcoplasmic Reticulum, at the level of the Z-line. The intimate association of these three membranous sturctures (Terminal Cisternae---T-Tubule---Terminal Cisternae) for a Triad. This differs from a diad (or Dyad), in cardiac muscle where the T-Tubule is only intimately associated with ONE Terminal Cisternae.
action potential propagating down the T tubule
D. T. Westwick has written: 'Identification of nonlinear physiological systems'
one transverse tubule and two terminal cisternae
Madlon T. Laster has written: 'Teach the way the brain learns' -- subject(s): Brain, Physiological aspects of Learning, Learning, Curricula, Education, Psychology of Learning, Physiological aspects
Centrioles. Also termed - M T O C's. Micro- Tubule- Organizing- Centers.