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WorksheetsRefresher course-physiology
Total questions: 5
Worksheet time: 5mins
Amy changes her posture from supine to upright position during a practical session of lung function test. The best statement that describes the changes of ventilation and perfusion is:
Lung tissue at the base expands more compared to apex.
More oxygen being delivered to the apex compared to the base of the lung.
Perfusion is higher at the apex compared to the base of the lung.
Ventilation is higher at the apex compared to the base of the lung.
Ventilation perfusion ratio increases from apex to the base of the lung.
When a person is in an upright position, pulmonary ventilation and perfusion ratio is unequal throughout lung regions. Select the best explanation for the ratio inequality.
Higher blood pressure in pulmonary arterioles reduces blood flow at the basal region.
In the middle region, perfusion is dependent on alveolar pressure.
Large alveoli in the apical region compress the capillaries and reduce perfusion.
More negative intrapleural pressure at the base increases alveolar ventilation.
Small alveoli at the base open up capillaries to increase perfusion.
A 29-year-old construction worker was diagnosed to have pulmonary tuberculosis. The Mycobacterium grows preferentially at the apex of the lungs. This is mainly due to
higher ventilation at the apex.
higher ventilation/perfusion ratio at the apex.
lower perfusion at the apex.
lower temperature at the apex.
the apex of the lungs is higher than the heart at upright position.
A group of student was standing quietly in front of the headmaster during assembly. Select the best explanation for the ventilation perfusion ratio inequality during standing.
High alveolar pressure in the apical region reduce perfusion.
Higher blood pressure in pulmonary arterioles reduces perfusion at the basal region.
Intermittent perfusion in the middle region is due to increase in alveolar pressure.
More negative intrapleural pressure at the base increases alveolar ventilation.
Small alveoli at the base open up capillaries to increase perfusion.
Ventilation and perfusion are not uniform throughout the lungs. Select the statement that best describes the ventilation and perfusion in an upright person.
Ventilation/perfusion ratio at the apex is less than 1.0.
Ventilation increases more slowly than perfusion from the apex to the base.
In lobar pneumonia, the ventilation/perfusion ratio decreases.
Hypoxic vasoconstriction in the affected area as a response to decreased perfusion.
Mismatching of perfusion and alveolar ventilation causes systemic arterial hypocapnia.
