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SERCA: Calcium Ion Pump quiz

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  • What does SERCA stand for?
    SERCA stands for Sarcoplasmic/Endoplasmic Reticulum Calcium ATPase.
  • What type of ATPase is the SERCA pump?
    The SERCA pump is a P-type ATPase.
  • What is the main function of the SERCA pump?
    The SERCA pump transports calcium ions (Ca2+) from the cytoplasm into the sarcoplasmic or endoplasmic reticulum.
  • What is a uniporter, and how does it relate to SERCA?
    A uniporter transports one type of molecule in one direction; SERCA is a uniporter for calcium ions.
  • How many calcium ions does the SERCA pump move per cycle?
    The SERCA pump moves two calcium ions per cycle.
  • What happens to the SERCA pump during its operation?
    The SERCA pump becomes phosphorylated, forming a phosphorylated intermediate.
  • What energy source does the SERCA pump use?
    The SERCA pump uses ATP, hydrolyzing it to ADP.
  • Why is maintaining low cytoplasmic calcium concentration important?
    Low cytoplasmic calcium is crucial for various cell functions, including muscle relaxation.
  • What cellular process is triggered by increased cytoplasmic calcium concentration?
    Increased cytoplasmic calcium concentration triggers muscle contraction.
  • How does the SERCA pump contribute to muscle relaxation?
    By pumping calcium into the SR or ER, the SERCA pump lowers cytoplasmic calcium, leading to muscle relaxation.
  • In what cellular compartments does the SERCA pump move calcium?
    The SERCA pump moves calcium from the cytoplasm into the sarcoplasmic or endoplasmic reticulum.
  • What role does calcium play as an intracellular signal?
    Calcium acts as an intracellular signal in virtually all cells, influencing processes like muscle contraction.
  • What happens to the SERCA pump after ATP is hydrolyzed?
    After ATP is hydrolyzed, the SERCA pump is phosphorylated and can transport calcium ions.
  • What is the effect of the SERCA pump on cytoplasmic calcium levels?
    The SERCA pump decreases cytoplasmic calcium levels.
  • What will be discussed later in the course regarding calcium?
    Later in the course, calcium's role in bio-signaling pathways will be discussed.