Comment by hinkley
3 days ago
And the muscles. You can’t fight or flight if you have to ask the liver to deliver glycogen. That’s how anaerobic exercise works. You have the fuel but not enough oxygen to burn it so you burn it fuel rich and oxidizer poor.
Not quite. The body will just enter ketosis if glucose and glycogen levels are too low.
The grandparent means something a bit different. Muscles can use glucose without _oxygen_ to get short bursts of energy quickly by rearranging glucose molecules (indirectly) into lactic acid.
Ketones can't be used for this purpose.
Glycogen is stored in the muscles and in the liver, not just the liver. The liver holds around half of your reserves.