During exercise, breathing becomes faster and deeper mainly to

  1. remove extra carbon dioxide and supply oxygen
  2. cool the body
  3. make more mucus
  4. slow the heart
Answer

A) remove extra carbon dioxide and supply oxygen

More respiration produces more CO₂. O Level Biology · Topic 9 Human Gas Exchange · 9.1 Human gas exchange

Biology MCQ · More O Level Biology: Human Gas Exchange MCQs · Practise