Yes, Connor is right. I'd just like to precise some facts on the metabolism: the production of CO2 in the core will be about the same as normally (working in aerobic metabolism), while extremities (legs, hands) will produce only little of CO2. When the diving response kicks in, namely the vasoconstriction in extremities, the blood circulation will be quite limited to the peripheral parts. It means the muscles will have to switch to anaerobic metabolism, producing acid lactic instead of CO2 and H2O like in aerobic mode. The acid lactic will be reconverted into CO2 and H2O later, once oxygen is available again.
Otherwise, you will find plenty of info about FRC here on DB - just enter the term FRC into the search box above in the menu. You may use the advanced search mode and limit the search to titles only to avoid too many hits
Also look up posts by Sebastian Murat. You can also check the links here:
FRC @ APNEA.cz Especially the article by Sebastian Näslund is quite informative.
