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What is stored in the terminal cisternae?
calcium
What does the terminal cisternae of the sarcoplasmic reticulum release?
The terminal cisternae release calcium ions into the muscle cell in response to an action potential. This calcium triggers muscle contraction by binding to troponin, which allows myosin to bind with actin and initiate the sliding filament mechanism.
Normally stored in the terminal cisternae?
Calcium
What is normally stored in terminal cisternae?
Calcium
Where are the calcium ions stored in the muscle cells?
terminal cisternae of the sarcoplasmic reticulum
What stores calcium important in muscle contractions?
The Sarcoplasmic Reticulum stores calcium and releases it through the terminal cisternae into the tubule.
The part of the sarcoplasmic reticulum where calcium ions are stored called?
The part of the sarcoplasmic reticulum where calcium ions are stored is called the terminal cisternae. These structures are found at the ends of the sarcoplasmic reticulum and play a key role in releasing calcium ions into the muscle cell during muscle contraction.
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.
Two terminal cisternae and a T- tubule?
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.
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
Enlarged portion of sacroplasmic reticulum on either side of a transverse tubule?
These structures are called terminal cisternae, and they function to store and release calcium ions during muscle contraction. The close proximity of terminal cisternae to transverse tubules allows for efficient communication and regulation of calcium release during excitation-contraction coupling in muscle cells.
Does a stimulus traveling toward a synapse appear to open calcium ion channels in the axon terminal?
Yes, a stimulus triggers the opening of voltage-gated calcium channels in the axon terminal. When activated by an action potential, these channels allow calcium ions to enter the axon terminal, which then triggers the release of neurotransmitters into the synaptic cleft.
