Human Lungs Have Evolved to Breathe Oxygen at a Pressure

question 9

Multiple Choice

Human lungs have evolved to breathe oxygen at a pressure as that in the atmosphere,0.21 atm.If a particular heliox mixture to be carried by a scuba diver is at a pressure of 7.00 atm,what should be the partial pressure due to helium in order to maintain the pressure due to oxygen at 0.21 atm?

• A)0.21 atm
• B)7.00 atm
• C)6.79 atm
• D)7.21 atm
• E)none of the above

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