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  • Question 1 - A lung function test is being performed on a male patient. For this...

    Correct

    • A lung function test is being performed on a male patient. For this patient, which of the following volumes for functional residual capacity is considered a normal result?

      Your Answer: 2.0 L

      Explanation:

      The volume of air that remains in the lungs after a single breath is known as functional residual capacity (FRC). It is calculated by combining the expiratory reserve volume and residual volume. In a 70 kg, average-sized male, a normal functional residual capacity is approximately 2100 mL.

    • This question is part of the following fields:

      • Physiology
      • Respiratory Physiology
      4
      Seconds

  • Question 2 - The transport of oxygen from maternal to fetal circulation is made possible by...

    Incorrect

    • The transport of oxygen from maternal to fetal circulation is made possible by fetal haemoglobin. Which of the statements about fetal haemoglobin (HbF) is also correct?

      Your Answer: It is composed of two alpha and two beta subunits

      Correct Answer: The oxygen dissociation curve for foetal haemoglobin is shifted to the left of that of adult haemoglobin

      Explanation:

      Fetal haemoglobin is the most common type of haemoglobin found in the foetus during pregnancy. It transports oxygen from the maternal circulation to the fetal circulation. It can easily bind to oxygen from the maternal circulation because it has a high affinity for oxygen. From 10 to 12 weeks of pregnancy to the first six months after birth, the erythroid precursor cells produce fetal haemoglobin. In comparison to adult haemoglobin, fetal haemoglobin has two alpha and two gamma subunits, whereas adult haemoglobin has two alpha and two beta subunits in its major form.

      And, unlike adult haemoglobin, the oxygen dissociation curve of fetal haemoglobin is left-shifted. Myoglobin is an oxygen storage molecule with a very high affinity for oxygen. Only when the partial pressure of oxygen is exceeded does it release oxygen.

    • This question is part of the following fields:

      • Physiology
      • Respiratory Physiology
      5.7
      Seconds

  • Question 3 - When the pulmonary artery is completely blocked, what is the ventilation over perfusion...

    Correct

    • When the pulmonary artery is completely blocked, what is the ventilation over perfusion ratio for the area that it supplies?

      Your Answer: Infinity

      Explanation:

      The ventilation/perfusion ratio (V/Q ratio) is a ratio used to assess the efficiency and adequacy of the matching ventilation and perfusion.

      A pulmonary artery carries deoxygenated blood from the right side of the heart to the lungs. When a large pulmonary embolus completed blocked a pulmonary artery the alveoli were ventilated but not perfused at all, then the V/Q ratio would be infinity.

    • This question is part of the following fields:

      • Physiology
      • Respiratory Physiology
      1.2
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Physiology (2/3) 67%
Respiratory Physiology (2/3) 67%
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