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. A climber attempts an assault on a high mountain in the Andes and reaches an altitude of 5000 meters (16,400 ft) above sea level. What will happen to his arterial PCO₂ and pH?

Both will be lower than normal. correct incorrect

The pH will rise and PCO₂ will fall. correct incorrect

Both will be higher than normal due to the physical exertion. correct incorrect

The pH will fall and PCO₂ will rise correct incorrect

* not completed

. A climber ascends to an altitude of 4,500 m. Which of the physiological changes listed below will occur?

Her heart rate will increase even at rest correct incorrect

Her blood pH will fall correct incorrect

Her resting ventilation will increase. correct incorrect

Her alveolar PO₂ will be less than 60 mm Hg correct incorrect

Her arterial blood pressure will increase correct incorrect

* not completed

. Pulmonary hypertension is a feature of life at high altitude

True correct incorrect

False correct incorrect

* not completed

. Which of the following will be encountered after an individual is acclimatized to high altitude?

Blood pH is approximately normal correct incorrect

There is an increase in red cell count correct incorrect

Cardiac output at rest is higher than that at sea level correct incorrect

Periodic breathing may occur, especially during sleep correct incorrect

* not completed

. It is safe to breathe pure oxygen when diving to depths up to 30 m

True correct incorrect

False correct incorrect

* not completed

. Which of the following statements regarding diving are true?

The pressure experienced by a diver increases by 1 atmosphere for every 10 m increase in depth. correct incorrect

It is safe to breathe compressed air at depths in excess of 60 m. correct incorrect

On ascent there is a risk of gas bubbles forming in the small blood vessels. correct incorrect

Changes in the volume of air cavities in the body may cause barotrauma during ascent. correct incorrect