PHY-C Bone and PTH Physiology Quiz
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Questions and Answers

What is the main physiological effect of hypercalcemia on the nervous system?

  • Depression of the nervous system (correct)
  • Hyperactivity of the nervous system
  • No effect on the nervous system
  • Enhancement of the nervous system
  • How does an increase in calcium concentration affect the activity of PTH?

  • Increases the activity of PTH
  • Has no effect on the activity of PTH
  • Decreases the activity of PTH (correct)
  • Halts the production of PTH
  • What is the primary role of calcitonin in calcium regulation?

  • Increase calcium levels in the blood
  • Regulate phosphate levels in the blood
  • No role in calcium regulation
  • Decrease calcium levels in the blood (correct)
  • What is the function of the calcium-sensing receptor located in the parathyroid cell membranes?

    <p>Inhibit PTH production</p> Signup and view all the answers

    What physiological processes does calcium play a key role in?

    <p>Muscle contraction and nerve function</p> Signup and view all the answers

    How does hypercalcemia affect the nervous system?

    <p>It depresses the nervous system</p> Signup and view all the answers

    What is the normal value of calcium in millimoles per liter?

    <p>2.4 mmol/L</p> Signup and view all the answers

    How does an increase in calcium concentration affect the activity of PTH?

    <p>It decreases the activity of PTH</p> Signup and view all the answers

    What is the role of Calcitonin in calcium regulation?

    <p>Inhibits bone resorption, decreasing calcium levels in the bloodstream</p> Signup and view all the answers

    How does the body detect changes in extracellular fluid calcium ion concentrations?

    <p>Using a receptor called the calcium-sensing receptor</p> Signup and view all the answers

    In what scenario does PTH play a role in altering calcium levels?

    <p>Increased activity of PTH</p> Signup and view all the answers

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