Why does the breathing rate not return to normal after vigorous exercise?

During vigorous exercise, muscles are not supplied with enough oxygen. This means that cells have to respire anaerobically. Anaerobic respiration involves no oxygen. This leads to a build-up of lactic acid in the muscles and creates an oxygen debt. Lactic acid causes muscle fatigue and prevents muscles from contracting efficiently. In order to remove the lactic acid, it needs to be oxidised. The increased breathing rate allows more oxygen to enter the body and help to remove the lactic acid. 

SH
Answered by Sadia Halimah A. Biology tutor

22836 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

How does vaccination prevent illness?


Why do the number of blood cells change in a person with an infection?


Describe the process of diffusion with an example.


What is the difference between meiosis and mitosis?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning