That’s true of the metabolic pathways for fat, protein, and alcohol, too. Each oxygen molecule we breathe feeds into chemical reactions so that it picks up a carbon atom and becomes CO2 on the way out. The carbon comes from whatever food was metabolized, including anaerobic respiration where the lactic acid eventually gets cleared out.
sparkyshocks@lemmy.zip 2 weeks ago
That’s true of the metabolic pathways for fat, protein, and alcohol, too. Each oxygen molecule we breathe feeds into chemical reactions so that it picks up a carbon atom and becomes CO2 on the way out. The carbon comes from whatever food was metabolized, including anaerobic respiration where the lactic acid eventually gets cleared out.