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Terminal cisternae are specialized structures found in skeletal muscle fibers that are part of the sarcoplasmic reticulum. They serve as reservoirs for calcium ions, which are essential for muscle contraction. These cisternae are located adjacent to the T-tubules and play a crucial role in the excitation-contraction coupling process by releasing calcium in response to action potentials. Their arrangement helps ensure rapid and coordinated muscle contraction.
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The triads of a muscle fiber consist of?
Two terminal cisternae and a T-tubule
What is stored in the terminal cisternae?
calcium
What is normally stored in terminal cisternae?
Calcium
Normally stored in the terminal cisternae?
Calcium
In relaxed muscle fiber which structure stores calcium?
It is the Terminal Cisternae- Sac like regions of the sarcoplasmic reticulum that serve as specialized resevoirs of calcium ions
A triad composed of T-tubule and two adjacent to terminal Cisternae of the sarcoplasmic reticulum How are these components connected?
A triad in skeletal muscle consists of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum, which are connected functionally and structurally. The T-tubule invaginates into the muscle fiber and facilitates the rapid transmission of action potentials, while the terminal cisternae store calcium ions. When an action potential travels down the T-tubule, it triggers the release of calcium from the terminal cisternae into the cytoplasm, initiating muscle contraction. This close proximity allows for efficient coupling of electrical signals and calcium release necessary for muscle contraction.
Where are the cross bridges involved in muscle contraction?
in the terminal cisternae
What is the difference between a dyad and triad in skeletal cardiac muscle?
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.
The skeletal muscle complex known as the triad consists of what?
one transverse tubule and two terminal cisternae
What is formed by a t tubule and two adjacent terminal cisternae?
Triad
What are the complex of a transverse tublue and two adjacent terminal cisternae is known as?
Triad
Where are the calcium ions stored in the muscle cells?
terminal cisternae of the sarcoplasmic reticulum
