Where are CO2 sensors in the body

[J Campbell]

OK. So my retired Navy doctor friend doesn't believe me when I tell him that the CO2 sensors in our bodies are "somewhere near the ear" - I couldn't remember the exact location. But he says no, "your whole brain can sense CO2" and that's what makes you want to breath. So, where/how does our body sense CO2 levels?

 

[MarcinB]

There are two types of receptors in human body that sense blood CO2 level: central chemoreceptors in the brain stem and in some other regions of the brain, and peripheral chemoreceptors found in the carotid arteries and in the arch of the aorta.