Calcium
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Questions and Answers

What percentage of the body's calcium is found in bones and teeth?

  • 90%
  • 99% (correct)
  • 80%
  • 95%
  • Which of the following is a good source of calcium according to the text?

  • 1 small carton of yoghurt (correct)
  • 1 medium-sized apple
  • 1 small carton of orange juice
  • 125g of milk
  • What is the Recommended Dietary Allowance (RDA) of calcium for individuals aged 18+ years?

  • 1200mg (correct)
  • 500mg
  • 1000mg
  • 800mg
  • What percentage of calcium is absorbed actively in the small intestine?

    <p>30%</p> Signup and view all the answers

    What is the plasma concentration of Ca+?

    <p>9-10.4 mg/100 ml</p> Signup and view all the answers

    Which physiological factor affects calcium absorption?

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

    What is the main function of calcium in the body?

    <p>Bone structure</p> Signup and view all the answers

    Which of the following contributes to dietary factors affecting calcium absorption?

    <p>Oxalates and phytates in foods</p> Signup and view all the answers

    What is the calcium intake recommendation for individuals aged 1-10 years?

    <p>1000mg</p> Signup and view all the answers

    Which vitamin is essential for calcium deposition?

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

    What percentage of calcium is found in body fluids such as blood and extracellular fluid?

    <p>1%</p> Signup and view all the answers

    What is the calcium intake recommendation for individuals aged 11-17 years?

    <p>1200mg</p> Signup and view all the answers

    What is the normal range for plasma Ca+ concentration?

    <p>9-10.4 mg/100 ml</p> Signup and view all the answers

    Which hormone inhibits vitamin D and prevents reabsorption of calcium?

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

    What is the function of parathyroid hormone (PTH) and vitamin D in calcium metabolism?

    <p>Stimulate calcium reabsorption</p> Signup and view all the answers

    What is the role of calcitonin in response to rising blood calcium levels?

    <p>Inhibits resorption and prevents reabsorption</p> Signup and view all the answers

    What is the consequence of high blood calcium in calcium metabolism?

    <p>Bone demineralisation</p> Signup and view all the answers

    What is the function of osteoclasts in calcium metabolism?

    <p>Mobilization of calcium</p> Signup and view all the answers

    What is the definition of osteoporosis according to the World Health Organization (WHO)?

    <p>BMD more than −2.5 SD below the young adult mean</p> Signup and view all the answers

    What is the upper limit for calcium intake to avoid toxicity?

    <p>2500 mg/day</p> Signup and view all the answers

    What are the potential consequences of calcium toxicity?

    <p>Calcification of soft tissue</p> Signup and view all the answers

    What are the consequences of calcium deficiency?

    <p>Reduced bone mass</p> Signup and view all the answers

    What is the method used to assess bone mineral density (BMD)?

    <p>Dual-energy X-ray absorptiometry (DEXA)</p> Signup and view all the answers

    What is the role of adequate calcium intake in relation to skeletal growth?

    <p>Essential for peak bone mass (PBM)</p> Signup and view all the answers

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