Which statements show how an oxygen debt is repaid after vigorous exercise? 1 Lactic acid is carried to the liver. 2 Lactic acid is broken down aerobically. 3 Heart rate remains high so that lactic acid is removed from the muscles.
- A1 and 2 only
- B1 and 3 only
- C1, 2 and 3
- D2 and 3 only