Respiration 2: Blood Gas Transport and Oxygenation
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Questions and Answers

What happens to the partial pressure of oxygen around tissues when you exercise?

  • It remains constant at 100 mmHg
  • It stays at 60 mmHg
  • It increases above 100 mmHg
  • It drops to below 40 mmHg (correct)
  • What is the percentage of hemoglobin saturation at 100 mmHg PO2?

  • 100%
  • 90%
  • 80%
  • 97% (correct)
  • What happens to the oxyhemoglobin dissociation curve when alveolar PO2 decreases to 60 mmHg?

  • It remains unchanged (correct)
  • It shifts to the right
  • There is a significant change in % HbO2 saturation
  • It shifts to the left
  • What is the effect of an increase in temperature on the oxyhemoglobin dissociation curve?

    <p>It shifts the curve to the right</p> Signup and view all the answers

    What happens to the O2 bound to hemoglobin when the oxyhemoglobin dissociation curve shifts to the right?

    <p>Less oxygen is bound to hemoglobin</p> Signup and view all the answers

    What is the effect of an increase in PCO2 on the oxyhemoglobin dissociation curve?

    <p>It shifts the curve to the right</p> Signup and view all the answers

    What happens to the pH during muscular exercise in skeletal muscle?

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

    Why does hemoglobin give up more oxygen to the exercising muscle during muscular exercise?

    <p>Due to an increase in temperature and PCO2 and a decrease in pH</p> Signup and view all the answers

    What is the effect of a rightward shift of the oxyhemoglobin dissociation curve on the exercising muscle?

    <p>It increases the amount of oxygen available to the exercising muscle</p> Signup and view all the answers

    What happens to the dissolved oxygen level during muscular exercise in skeletal muscle?

    <p>It is still relatively high</p> Signup and view all the answers

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