Respuesta :
I think the answer would be C. increased respiration rate when your muscles need more oxygen
The correct answer would be C.
During exercise when your muscles need more O2 and CO2 levels in blood have gone higher, the respiration rate is increased(controlled by brain specifically the medulla oblongata)
During exercise when your muscles need more O2 and CO2 levels in blood have gone higher, the respiration rate is increased(controlled by brain specifically the medulla oblongata)