The following changes take place in an athlete’s body during a 100m race. Which change occurs first?A. Increased availability of oxygen to muscles. B. Increased breathing rate. C. Increased carbon dioxide concentration in the blood D. Increased production of carbon dioxide by muscles

The following changes take place in an athlete’s body during a 100m

1.	The following changes take place in an athlete’s body during a 100m race. Which change occurs first?A. Increased availability of oxygen to muscles. B. Increased breathing rate. C. Increased carbon dioxide concentration in the blood D. Increased production of carbon dioxide by muscles
Answer» Running is a heavy energy requiring process. Thus while running a 100m race, there will be a great need of energy to muscles. Thus they will start performing respiration at much higher rate. Due to this reason, there will be increased release of CO₂ by muscles.