MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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specialized smooth endoplasmic reticulum that surrounds each myofibril, it stores calcium and releases on demand
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sarcolemma
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sarcoplasmic reticulum
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thick filament
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thin filament
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Explanation:
Detailed explanation-1: -The sarcoplasmic reticulum is the major intracellular organelle for controlling the cytosolic calcium during contraction. In the adult, only a small amount of extracellular calcium enters the myocyte and elicits the release of a larger amount of calcium from the sarcoplasmic reticulum.
Detailed explanation-2: -Calcium ion release from the SR, occurs in the junctional SR/terminal cisternae through a ryanodine receptor (RyR) and is known as a calcium spark. There are three types of ryanodine receptor, RyR1 (in skeletal muscle), RyR2 (in cardiac muscle) and RyR3 (in the brain).
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