Which of the following statements is not correct for a striated muscle when it contracts?

Which of the following statements is not correct for a striated muscle when it contracts? Correct Answer No change in the length of I band.

The correct answer is No change in the length of I band.

Important Points

  • The main function of striated muscle tissue is to create force and contract.
  • These contractions will either pump blood throughout the body (cardiac muscle) or powers breathing, movement or posture (skeletal muscle).

Key Points

  • Contraction
    • Contractions in cardiac muscle tissue are due to pacemaker cells.
    • These cells respond to signals from the autonomic nervous system to either increase or decrease the heart rate.
    • Pacemaker cells have autorhythmicity.
    • The set intervals at which they depolarize to threshold and fire action potentials is what determines the heart rate.
    • Because of the gap junctions, the pacemaker cells transfer the depolarization to other cardiac muscle fibres, in order to contract in unison.
    • Signals from motor neurons cause myofibers to depolarize and therefore release calcium ions from the sarcoplasmic reticulum.
    • The calcium drives the movement of myosin and actin filaments.
    • The sarcomere then shortened which causes the muscle to contract. 
    • In the skeletal muscles connected to tendons that pull on bones, the Mysia fuses to the periosteum that coats the bone.
    • Contraction of the muscle will transfer to the Mysia, then the tendon and the periosteum before causing the bone to move.
    • The Mysia also may bind to an aponeurosis or to the fascia.

Additional Information

  • Striated muscle tissue
    • Striated muscle tissue is a muscle tissue that features repeating functional units called sarcomeres.
    • The presence of sarcomeres manifests as a series of bands visible along the muscle fibres, which is responsible for the striated appearance observed in microscopic images of this tissue.
    • There are two types of striated muscles:
      • Cardiac muscle (heart muscle)
      • Skeletal muscle (muscle attached to the skeleton)
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