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NYCC Systems Phys > Gas Exchange > Flashcards

Gas Exchange Flashcards

1
Q

gas exchange relies on ____

A

diffusion

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2
Q

what increases diffusion?

A
  • increased surface area
  • increased solubility
  • higher temperatures
  • larger pressure differences
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3
Q

what decreases diffusion?

A

increased distance & molecular weight

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4
Q

what is the pressure of atmospheric air?

A

1 ATM = 760mmHg

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5
Q

what has similar solubility & binding to O2?

A

carbon monoxide

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6
Q

what is 20x more soluble than oxygen?

A

CO2

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7
Q

what is the percent of nitrogen, oxygen, and carbon dioxide in the air?

A

79% N
20.7% O2
0.3% CO2

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8
Q

what is the partial pressure of oxygen?

A

160mmHg

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9
Q

what is the partial pressure of nitrogen?

A

600mmHg

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10
Q

what is the pressure of oxygen in the lungs?

A

104mmHg

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11
Q

what is the pressure of CO2 in the lungs?

A

40mmHg

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12
Q

what is the pressure of oxygen in the tissue?

A

40mmHg

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13
Q

what is the pressure of CO2 in the tissue?

A

45mmHg

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14
Q

what is the pressure of oxygen in the cells?

A

<20mmHg

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15
Q

what is the pressure of CO2 in the cells?

A

46mmHg

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16
Q

what is the pressure of oxygen in the systemic veins?

A

40mmHg

17
Q

what is the pressure of CO2 in the systemic veins?

A

45mmHg

18
Q

what is the pressure of oxygen in the pulmonary artery?

A

40mmHg

19
Q

what is the pressure of CO2 in the pulmonary artery?

A

45mmHg

20
Q

to increase diffusion of a gas through a membrane, what physiological changes would occur to:
pressure gradient
cross-sectional area
solubility
distance
molecular weight

A

increase
increase
increase
decrease
decrease

21
Q

which gas is often used to estimate the O2-diffusing capacity of the lungs?

A

carbon monoxide (CO)

NYCC Systems Phys (42 decks)

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