Calcium and Phosphorus
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Questions and Answers

Which hormone increases plasma [Ca2+] and decreases plasma [Pi] levels?

  • Vitamin D
  • Parathyroid hormone (PTH) (correct)
  • Glucocorticoids
  • Calcitonin
  • What is the active form of Vitamin D?

  • 1,25(OH)2D3. (correct)
  • Vitamin D-binding protein (DBP)
  • 25(OH) D3
  • 1α-hydroxylase
  • Which hormone decreases plasma [Ca2+] and [Pi] levels?

  • Parathyroid hormone (PTH)
  • Thyroid hormones
  • Calcitonin (correct)
  • Vitamin D
  • Which hormone increases plasma [Ca2+] and [Pi] levels?

    <p>Vitamin D</p> Signup and view all the answers

    Which of the following is NOT a function of PTH (parathyroid hormone)?

    <p>Increase calcium absorption in the intestines</p> Signup and view all the answers

    Which of the following is responsible for the regulation of PTH secretion?

    <p>Calcium levels in the blood</p> Signup and view all the answers

    What is the active form of vitamin D?

    <p>Calcitriol</p> Signup and view all the answers

    What is the primary response to hypocalcemia?

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

    Which of the following is the key factor that determines the threshold voltage to fire an action potential in the presence of hypocalcemia?

    <p>Voltage-gated Na channels activation</p> Signup and view all the answers

    What is the most common cause of rickets in a growing person?

    <p>Deficiency in Vitamin D production and activation</p> Signup and view all the answers

    What is the characteristic feature of osteoporosis?

    <p>Progressive loss of bone matrix</p> Signup and view all the answers

    What is the most expected effect of treating animals with an antiCaSR (Ca-sensing receptor) antibody to block CaSR?

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

    Which form of calcium is physiologically active?

    <p>Ionized (free) calcium</p> Signup and view all the answers

    What percentage of total plasma calcium concentration is bound to protein (albumin)?

    <p>45%</p> Signup and view all the answers

    Which of the following actions is NOT regulated by vitamin D?

    <p>Stimulating PTH secretion</p> Signup and view all the answers

    How does calcitriol increase calcium absorption in the small intestine?

    <p>By stimulating synthesis of calcium binding protein</p> Signup and view all the answers

    What effect does calcitonin have on bone resorption?

    <p>It inhibits osteoclast activity</p> Signup and view all the answers

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