mdcat logical reasoning MCQ #750

During the first stage of muscle contraction, a 16-year-old athlete's muscle experiences a rapid increase in Ca2+ ions.

mdcat logical reasoning MCQ #750

  1. Question 1

    Q1. During the first stage of muscle contraction, a 16-year-old athlete's muscle experiences a rapid increase in Ca2+ ions.

    • A) Skeletal muscles rely on the sliding filament theory to generate force.
    • B) Muscle contraction occurs due to the depolarization of the T-tubule
    • C) The actin-myosin complex interacts with troponin-tropomyosin to regulate muscle contraction.
    • D) A muscle action potential triggers the release of Ca2+ ions from the sarcoplasmic reticulum.

    Answer: A muscle action potential triggers the release of Ca2+ ions from the sarcoplasmic reticulum.

    Explanation: Troponin-tropomyosin's inhibitory effect is bypassed, but not by Ca2+ ions. USAT, HAT and MDCAT analytical sections repeat this pattern.