Question:
Sarcoplasmic reticulum of the muscle fiber stores
Sarcoplasmic reticulum of the muscle fiber stores
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SR = Ca²⁺ store → triggers muscle contraction.
Updated On: Jul 18, 2026
- Sarcoplasm
- Potassium ions
- Calcium ions
- Collagen
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The Correct Option is C
Solution and Explanation
Step 1: Understanding muscle cell structure.
Muscle fibers contain specialized organelles for contraction. One such structure is the sarcoplasmic reticulum, derived from endoplasmic reticulum.
Step 2: Function of sarcoplasmic reticulum.
It is responsible for regulating calcium ion concentration inside muscle cells. Calcium plays a central role in muscle contraction and relaxation.
Step 3: Calcium storage mechanism.
During rest, calcium ions are stored in the sarcoplasmic reticulum. When stimulated, calcium is released into the cytoplasm to initiate contraction.
Step 4: Role in muscle contraction.
Released calcium binds to troponin, allowing actin-myosin interaction. This leads to muscle contraction through sliding filament mechanism.
Step 5: Evaluation of other options.
Sarcoplasm is cytoplasm of muscle cell, potassium ions are mainly extracellular, and collagen is structural protein of connective tissue.
Step 6: Final conclusion.
Thus, sarcoplasmic reticulum stores calcium ions.
Muscle fibers contain specialized organelles for contraction. One such structure is the sarcoplasmic reticulum, derived from endoplasmic reticulum.
Step 2: Function of sarcoplasmic reticulum.
It is responsible for regulating calcium ion concentration inside muscle cells. Calcium plays a central role in muscle contraction and relaxation.
Step 3: Calcium storage mechanism.
During rest, calcium ions are stored in the sarcoplasmic reticulum. When stimulated, calcium is released into the cytoplasm to initiate contraction.
Step 4: Role in muscle contraction.
Released calcium binds to troponin, allowing actin-myosin interaction. This leads to muscle contraction through sliding filament mechanism.
Step 5: Evaluation of other options.
Sarcoplasm is cytoplasm of muscle cell, potassium ions are mainly extracellular, and collagen is structural protein of connective tissue.
Step 6: Final conclusion.
Thus, sarcoplasmic reticulum stores calcium ions.
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