Respiratory Pigments and Gas Diffusion Quiz
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Questions and Answers

Which of the following respiratory pigments is a monomeric protein with a single heme molecule?

  • Hemerythrins
  • Hemoglobin
  • Hemocyanins
  • Myoglobin (correct)
  • Which of the following respiratory pigments have multiple O2 binding sites (up to 160)?

  • Chlorocruorins
  • Hemerythrins
  • Hemoglobin
  • Hemocyanins (correct)
  • Which of the following respiratory pigments is found in four types of marine annelid worms?

  • Hemoglobin
  • Chlorocruorins (correct)
  • Hemocyanins
  • Hemerythrins
  • Which of the following respiratory pigments is found intracellularly in muscle and blood cells?

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

    Which of the following respiratory pigments is found in blood and may have up to four heme-globin subunits?

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

    Which phase of the oxygen dissociation curve determines O2 loading at the gills or lungs?

    <p>Plateau phase</p> Signup and view all the answers

    Which phase of the oxygen dissociation curve determines O2 unloading at the tissues?

    <p>Steep phase</p> Signup and view all the answers

    As PO2 decreases, what happens to the off-loading of O2?

    <p>More off-loading of O2 occurs</p> Signup and view all the answers

    Which respiratory pigment shows no cooperativity and always has greater O2 affinity than hemoglobin?

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

    Which of the following gases no longer contribute to partial pressure when they chemically combine with other molecules?

    <p>Carbon dioxide</p> Signup and view all the answers

    Which of the following is true about the oxygen dissociation curve P50?

    <p>It measures the binding affinity of a respiratory pigment for O2.</p> Signup and view all the answers

    What does the P50 value represent on the oxygen dissociation curve?

    <p>The PO2 needed to reach 50% saturation.</p> Signup and view all the answers

    Which animal has a P50 value of approximately 6kPa PO2?

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

    What is hematocrit?

    <p>The fraction of blood volume made up by red blood cells.</p> Signup and view all the answers

    What factors affect the P50 value?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT an organophosphate modulator?

    <p>2,3-diphosphoglycerate (DPG)</p> Signup and view all the answers

    What is the main reason why fetal blood has higher O2 affinity than adult blood?

    <p>All of the above</p> Signup and view all the answers

    Which animals living in high O2 environments generally have high P50 and a strong Bohr shift?

    <p>Active animals</p> Signup and view all the answers

    Which animals generally have a low P50 and a blunted panic response to high CO2?

    <p>Burrowing mammals</p> Signup and view all the answers

    What is the relationship between body size and P50?

    <p>Smaller mammals have a lower P50.</p> Signup and view all the answers

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