mdcat logical reasoning MCQ #754

A 16-year-old athlete's muscle contraction is initiated by the

mdcat logical reasoning MCQ #754

  1. Question 1

    Q1. A 16-year-old athlete's muscle contraction is initiated by the

    • A) Release of ATP from the sarcoplasmic reticulum
    • B) Binding of Ca2+ ions to troponin
    • C) Depolarization of the T-tubule
    • D) Interaction of actin and myosin filaments

    Answer: Depolarization of the T-tubule

    Explanation: Depolarization of the T-tubule initiates muscle contraction, not ATP release. USAT, HAT and MDCAT analytical sections repeat this pattern.