WHY DO WE RESIRE
          The process of oxidation of food into carbon dioxide and water to produce energy is called respiration. On the basis of presence of oxygen respiration is of two types :
(a)     Aerobic respiration : When break-down of glucose occurs with the use of O2 , it is called aerobic respiration. In this process there is complete breakdown of food, so maximum production of energy.

 

 

(b)     Anaerobic respiration : When breakdown of glucose occurs in lack or limited supply of O2 is called anaerobic respiration.

During heavy exercise, when the supply of oxygen to our muscle cell is insufficient, food breakdown occurs by anaerobic respiration.

TYPES OF RESPIRATION
       There are two types of respiration – aerobic and anaerobic respiration.
1.    Aerobic Respiration :     When the breakdown of food substances (like glucose) takes place in the presence of oxygen with the release of a large amount of energy, it is called aerobic respiration. In this process, carbon dioxide and water are released          as waste products.
     The overall equation for aerobic respiration is:

Most animals including humans and green plants respire aerobically.

2.    Anaerobic Respiration : Anaerobic respiration is the breakdown of food substances with the release of a small amount of energy in the absence of oxygen. It occurs in certain organisms like yeast and some bacteria. These organisms are called                    anaerobes.

     In th absence of oxygen, glucose breaks down into alcohol and carbon dioxide with the release of comparatively less energy.
    The equation for anaerobic respiration is:

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Chapter 10: Respiration in Organisms

Cellular respiration takes place in the cells of all organisms. In the cell, the food (glucose) is broken down into carbon dioxide and water using oxygen. When breakdown of glucose occurs with the use of oxygen it is called aerobic respiration. Food can also be broken down, without using oxygen.

Why do we respire ?

We respire to use the oxygen, to oxidise our food and release energy. This is similar like burning but a slower process. It also needs respiratory enzymes .The job of your lungs is to provide your body with oxygen and to get rid of the waste gas, carbon dioxide. Your brain constantly gets signals from your body which detect the amount of oxygen and carbon dioxide in your blood.