During physical exercise, the respiration rate increases. Two students are discussing the mechanisms involved. Student A claims they are positive-feedback mechanisms, and student B claims they are negative feed back? Which student is right?

During physical exercise, the respiration rate increases. Two students are discussing the mechanisms involved. Student A claims they are positive-feedback mechanisms, and student B claims they are negative feed back? Which student is right?

Answer

• Student B is right: negative feed back
  Explanation:
  During exercise, breathing rate increases to provide the muscles with more oxygen for cellular respiration and at the same time remove carbon dioxide from muscle and tissues. This is a negative feedback because as exercise increases, carbon dioxide is released which increases acidity levels, the body reacting to this by increasing breathing rate to reduce the acidity and maintain a normal pH.

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