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

    Incorrect

    • 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: 0.5 L

      Correct 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
      67.5
      Seconds

  • Question 2 - A 64-year-old woman with a history of chronic breathlessness is referred for lung...

    Correct

    • A 64-year-old woman with a history of chronic breathlessness is referred for lung function testing.
      Which of the following statements regarding lung function testing is FALSE? Select ONE answer only.

      Your Answer: In restrictive lung disease, the FVC is increased

      Explanation:

      In restrictive lung disorders there is a reduction in the forced vital capacity (FVC) and the forced expiratory volume in one second (FEV1). The decline in the FVC is greater than that of the FEV1, resulting in preservation of the FEV1/FVC ratio (>0.7%).
      In obstructive lung disease, FEV1is reduced to <80% of normal and FVC is usually reduced but to a lesser extent than FEV1. The FEV1/FVC ratio is reduced to <0.7.
      According to the latestNICE guidelines(link is external), airflow obstruction is defined as follows:
      Mild airflow obstruction = an FEV1 of >80% in the presence of symptoms
      Moderate airflow obstruction = FEV1 of 50-79%
      Severe airflow obstruction = FEV1 of 30-49%
      Very severe airflow obstruction = FEV1<30%.
      Spirometry is a poor predictor of durability and quality of life in COPD but can be used as part of the assessment of severity.
      COPD can only be diagnosed on spirometry if the FEV1 is <80% and FEV1/FVC ratio is < 0.7.

    • This question is part of the following fields:

      • Physiology
      • Respiratory Physiology
      84.9
      Seconds

  • Question 3 - The transport of oxygen from maternal to fetal circulation is made possible by...

    Correct

    • 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: 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
      160
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

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