Class 11 Biology Breathing and Exchange of Gases Introduction

Introduction

  • This process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration.
  • Oxygen (O2) is utilised by the organisms to indirectly break down nutrient molecules like glucose and to derive energy for performing various activities.
  • Carbon dioxide (CO2) is released during the above catabolic reactions.

Class_11_Biology_Breathing_Exchange_of_Gases_Human_Respiratory_System

Fig. Human respiratory system

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