Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

How many feet below sea level must an individual descend to exert a total pressure on the body of 3 atmospheres (2280 mm Hg)?

A. 13 feet

B. 33 feet

C. 66 feet

D. 99 feet

Summary Introduction


The pressure that the atmosphere exerts is called atmospheric pressure. The sum of the partial pressures of all the gases present in the atmosphere is equal to the total atmospheric pressure. The partial pressure that a specific gas exerts in the atmosphere is calculated by multiplying the barometric pressure of the gas with its percentage in the atmosphere.


Justification/ Explanation for the correct answer:

Option (D) is 99 feet. The atmospheric pressure is known to decrease with the increase in altitude. Below the sea level, the atmospheric pressure increases. This increase is measured to be 1 atmosphere with a descent of 33 feet in the water. If the increase is three atmospheres, the descent will be three times of 33 feet. This makes the descent 99 feet in the water. Hence, option (D) is correct.

Explanation for the incorrect answers:

Option (A) is 13 feet. The change in the atmospheric pressure is 1 atmosphere when an individual descends 33 feet in water...

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