external and internl respiration, daltons law of partial pressure, blood flow in pulmonary capillaries
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Created by:
silvanajaffe on April 5, 2010
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13 terms
Terms | Definitions |
|---|---|
 external and internal respiration | gas exchange, movement of o2 and co2. o2 and co2 move by diffussion down their gradients |
| dalton's law of partial pressure | the total pressure of a gas mixture (air) is equal to the sum of the pressures of the individual gases. a gas will diffuse down its partial pressure gradient. |
| partial pressure | pressure due to one gas within a mixture |
| o2 | will diffuse from high po2 to low po2 |
| co2 | will diffuse from high pc02 to low pco2 |
| p air | 760 mmhg |
| po2 | 159 mmhg |
| pco2 | 0.3 mmhg |
| external respiration | gas exchange between air in alveolus and blood in pulmonary capillaries. o2 moves into blood and co2 moves out of blood |
| internal respiration | gas exchange between blood in systemic capillaries and tissues. 02 leaves blood co2 into blood. |
| blood flow in pulmonary capillaries | pulmonary capillaries pick up 02 and dump co2. pulmonary capillaries are under chemical control |
| if po2 is high and pco2 is low | good ventilation. causes vasodilation of local pulmonary capillaries |
| if po2 is low and pco2 is high | poor ventilation. cause vasoconstriction of the local pulmonary capillaries. |
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