The air will also be refreshed as required to keep the carbon dioxide level acceptable to the occupants.

Upon increase in carbon dioxide level at central chemoreceptors, it stimulates the sympathetic system to constrict vessels.

For example, a person with increased minute volume (e.g. due to hyperventilation) should demonstrate a lower blood carbon dioxide level.

Changes in ocean chemistry due to increasing carbon dioxide level cause weakening of coral skeletons and reduce the accretion of reefs, especially at higher latitudes.

As carbon dioxide levels got higher in my blood, the first thing the body did was get more of it to my brain.