So the partial pressure of carbon dioxide in the bag is higher, which forces that CO2 into your blood, which lowers its pH, and you get back to homeostasis.

所以袋子里的二氧化碳分压更高，这迫使二氧化碳进入你的血液，降低其 pH 值，你回到体内平衡。

The partial pressure of carbon dioxide is 40 mmHg in the alveolar air and 45 mmHg in the blood entering the lungs.

肺泡空气中的二氧化碳分压为40 mmHg，进入肺部的血液中的二氧化碳分压为45 mmHg。

As you can see in the picture above, the partial pressure of carbon dioxide in the alveolar air is about 40 mmHg.

如上图所示，肺泡空气中二氧化碳的分压约为40 mmHg。

Therefore, the partial pressure of oxygen is 100 mmHg and the partial pressure of carbon dioxide is 40 mmHg in the blood leaving the lungs.

因此，离开肺部的血液中氧分压为100 mmHg，二氧化碳分压为40 mmHg。

Likewise, carbon dioxide equilibrates across the respiratory membrane, so the partial pressure of carbon dioxide in the blood leaving the lungs is only 40 mmHg.

同样，二氧化碳在整个呼吸膜上达到平衡，因此，血液中离开肺的二氧化碳分压仅为40 mmHg。

It is important to note that the partial pressure of carbon dioxide increases in more metabolic tissues - for example, with exercise we make more carbon dioxide.

重要的是要注意，更多的新陈代谢组织中二氧化碳的分压会增加-例如，通过运动我们会产生更多的二氧化碳。