Ventilation perfusion ratio MCQ 11+

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• Ventilation - perfusion ratio
  ক

  Is the ratio of pulmonary ventilation to pulmonary blood flow

  খ

  Varies in various parts of lungs as an effect of gravity

  গ

  In upright position declines in a linear fashion from base to apex

  ঘ

  Non-uniformity of ventilation and perfusion of lungs can cause decline in co2 content

  ঙ

  Uniformity of this ratio can cause decline in systemic arterial PO2
• The pulmonary ventilation perfusion ratio is
  ক

  Increased by hemorrhage

  খ

  About 0.8 at heart Level

  গ

  More in base than apex on erect posture

  ঘ

  Decreased in exercise

  ঙ

  Decreased with increased physiological dead space ( ↓ in Physiological shunt )
• Apex of the upright human lung compared with the base has a higher
  ক

  Po2

  খ

  Ventilation-perfusion ratio

  গ

  Ventilation

  ঘ

  Blood flow

  ঙ

  Pco2
• From the base of lung to the apex there is an increase in
  ক

  Alveolar size

  খ

  Negative intrapleural pressure

  গ

  V/Q in erect posture

  ঘ

  Alveolar ventilation

  ঙ

  Compliance of the lung
• Compared with the base in upright human the apex of the lungs has a
  ক

  Higher PO2

  খ

  Higher ventilation perfusion ratio

  গ

  Larger alveoli

  ঘ

  Higher ventilation

  ঙ

  Higher PCO2
• Compared with the base, the apex of the human lungs has
  ক

  Higher PO2

  খ

  Larger alveoli

  গ

  More negative intrapleural pressure

  ঘ

  Higher ventilation rate

  ঙ

  Higher PCO2
• Compared to the base of the lungs, the apex of the upright human lungs has a higher
  ক

  Ventilation-perfusion ratio

  খ

  P02 of alveolar air

  গ

  Ventilation

  ঘ

  Blood flow

  ঙ

  Compliance of the lung
• Compared with the base, the apex of the upright human lung has a higher
  ক

  Negative intrapleural pressure

  খ

  PO2

  গ

  Ventilation perfusion ratio

  ঘ

  Compliance of the lungs

  ঙ

  Ventilation
• Compared with the base, the apex of the upright human lungs has
  ক

  Larger alveoli

  খ

  More negative intra-pleural pressure

  গ

  More P02

  ঘ

  More compliance

  ঙ

  More ventilation
• While standing, compared to the upper part of the lung, the lower portion of the lung has
  ক

  Higher ventilation

  খ

  Larger compliance

  গ

  Larger size of the alveoli

  ঘ

  Higher ventilation-perfusion ratio

  ঙ

  Higher alveolar PO2
• In an upright person, the apex of the lung compared with the base has
  ক

  A higher PO2

  খ

  A higher ventilation-perfusion ratio

  গ

  A higher ventilation

  ঘ

  A higher blood flow

  ঙ

  Smaller alveoli