MDCAT Biology MCQ #1703

In striated muscle fibers, a specialized membrane system is responsible for the release and sequestration of calcium ions. Identify this organelle.

MDCAT Biology MCQ #1703

  1. Question 1

    Q1. In striated muscle fibers, a specialized membrane system is responsible for the release and sequestration of calcium ions. Identify this organelle.

    • A) Rough Endoplasmic Reticulum
    • B) Nuclear Envelope
    • C) Smooth Endoplasmic Reticulum
    • D) Golgi Apparatus

    Answer: Smooth Endoplasmic Reticulum

    Explanation: Sarcoplasmic reticulum is a specialized Smooth ER in muscle cells that regulates calcium ions, unlike the Rough ER which handles protein synthesis.