The person who decreases their activity level and rests as much as possible.

The person who used to live in Mexico City (2240 meters above sea level) for two years.

The person who does their regular daily exercise at sea level and continues their exercise at higher altitude.

The person who had stayed for 2 days at altitude of 2000 meters before ascending to 3000 meters.

His systemic arterial blood PO2 would rise.

Oxygen would be displaced from his haemoglobin, lowering his blood oxygen content.

His blood would have a decreased oxygen-haemoglobin affinity.

His alveolar PO2 values would increase as more O2 is unloaded from the blood.

These values could be explained by a reduced diffusing capacity of the lungs for oxygen.

These values are typical for a healthy person.

The patient may have been hypoventilating.

The patient may have been hyperventilating.

Residual volume.

Functional residual capacity.

Inspiratory reserve volume.

Total lung volume.

filtered; secreted; reabsorbed

reabsorbed; filtered; secreted

filtered; reabsorbed; secreted

secreted; reabsorbed; filtered

Increase in the number of red blood cells.

Increase in the haemoglobin concentration.

All of the above.

Increase in pulmonary ventilation.

The region represents increased dead space.

The region represents decreased dead space.

The region represents an anatomical overflow of blood.

The region represents a physiological overflow of blood.

Pulmonary oedema.

Lung emboli.

Pneumonia.

Restrictive lung disease.

In the lung, the higher CO2 level enhances the binding of oxygen to haemoglobin.

In the lung, the decrease in hydrogen ion concentration enhances the binding of oxygen to haemoglobin.

In the muscle tissues, the high CO2 level decreases the dissociation of oxygen from haemoglobin.

In the muscle tissues, the high temperature decreases the dissociation of oxygen from haemoglobin.