Intracellular Calcium Control
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Questions and Answers

What is the primary function of intracellular calcium [Ca2+]i in living cells?

  • Regulating neurotransmission
  • Maintaining metabolism (correct)
  • Inducing necrosis
  • Controlling apoptosis

    • What is a disadvantage of Ca2+ overload in cells?

  • Loss of regulation and cell death (correct)
  • Enhanced regulation and cell survival
  • Rapid changes in [Ca2+]i levels
  • Rapid movement of Ca2+ across the plasma membrane

    • How do cells regulate their intracellular calcium [Ca2+]i levels?

  • By enhanced regulation through Ca2+ overload
  • By maintaining large inward gradient
  • By relative impermeability of the plasma membrane (correct)
  • By promoting rapid changes in [Ca2+]i with movement of little Ca2+

    • What is responsible for expelling Ca2+ from the cell using energy?

    <p>Ca2+ ATPase</p> Signup and view all the answers

    What is one of the advantages of the ability to expel Ca2+ using Ca2+ ATPase?

    <p>Maintains large inward gradient</p> Signup and view all the answers

    What is the resting membrane potential (RMP)?

    <p>The electrical potential difference across the plasma membrane of a cell at rest</p> Signup and view all the answers

    What creates an electro-chemical gradient across the cell membrane?

    <p>Na-K ATPase pump pumping 3 Na out in exchange of 2 K in</p> Signup and view all the answers

    What provides the basis for cell signaling?

    <p>Membrane potential</p> Signup and view all the answers

    What is the primary function of the Na-K ATPase pump on the cell membrane?

    <p>Pumping 3Na out in exchange for 2K in to create an electro-chemical gradient</p> Signup and view all the answers

    What does the resting membrane potential (RMP) express?

    <p>The potential inside the cell relative to the ECF</p> Signup and view all the answers

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