Multiple choice

Which among the following statements does not characterise skeletal striated muscle of the body?

  1. The sarcomere is the basic machinery of the muscle contraction.

  2. The myofibrils are long protein bundles containing mitochondria.

  3. The muscle fiber contains a smooth endoplasmic reticulum between the myofibrils.

  4. Contracting muscles produce vibration and sound.

  5. Once a cell is sufficiently stimulated, the cell's sarcoplasmic reticulum releases ionic calcium.
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C Correct answer
Explanation

While the muscle fiber does not have a smooth endoplasmic reticulum, it contains a sarcoplasmic reticulum. The sarcoplasmic reticulum surrounds the myofibrils and holds a reserve of the calcium ions needed to cause a muscle contraction.

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