Breathing Is An Exchange

Breathing is an exchange, usually oxygen, between an external and internal environment. We breathe of course through our lungs, in which this gas exchange takes place. But we also breathe through the skin, through the pores of our skin, and through it, takes place different exchanges between the outside and the inside (gas, oxygen and CO2, excretions/sweating). And we can there too talk about breathing, even if we are not aware of it.