The storehouse of calcium ions in a muscle fiber is the:
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Correct answer: Sarcoplasmic reticulum
The sarcoplasmic reticulum is an endoplasmic reticulum specialized for muscle cells. It functions as the primary reservoir for calcium ions, which are released into the sarcoplasm to trigger muscle contraction.
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More Muscle Structure questions
- The light bands of a myofibril contain which protein and are also known by what name?
- The functional unit of contraction in a muscle fiber, located between two successive Z-lines, is called a:
- The 'H-zone' in the skeletal muscle fiber is defined as:
- Which of the following is a complex protein that masks the active binding sites for myosin on the actin filaments in a resting state?
- Each myosin (thick) filament is a polymerized protein made of monomeric units called:
- The globular head of meromyosin possesses binding sites for: