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1. A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 950 torr...

1. A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 950 torr . If the partial pressures are oxygen 425 torr and helium 40 torr , what is the partial pressure (torr) of the nitrogen in the mixture?

2. When a person who cannot breathe properly is placed on a ventilator, an air mixture is delivered at pressures that are alternately above the air pressure in the person's lung, and then below. How will this move oxygen gas into the lungs, and carbon dioxide out? Complete the sentences below. Choices are below.

a. More gases will pass (blank) the blood when higher gas pressure is introduced by a ventilator.

b. More gases will pass (blank) the blood when a lower gas pressure is introduced into the lungs.

c. Because the air mixture has a (blank) partial pressure of oxygen than the blood, oxygen would (blank).

d. Because the air mixture has a (blank) partial pressure of carbon dioxide than the blood, CO2 would (blank).

Choices for #2:

enter the bloodstream

out of

be expelled

into

higher

lower

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