Respiration, std-10

Respiration:-                                                   

                                                         

Definition:-

1. The process of release of energy from the food is called Respiration.

2.The phenomenon in which energy releases by oxidation of glucose(food) for the cellular use is called respiration.

➤Reaction:-

      C6H12O6  + 6O2 ➜ 6CO2 + 6H2O +ATP(Energy) ⇈

→ It is a biochemical process which initiated in cytoplasm and completed in 
     mitochondria of the cell.

→  It occurs inside the cell only hence, known as Cellular respiration.

→  Energy releases in this process in the form of ATP  which is utilized to carry out 
    biological functions that is essential for life processes.

➤Note:-

 (i) Breathing:- The mechanism by which organism obtain oxygen (o2) from the air and  releases co2 is called breathing.

➤Types of respiration- On the basis of obtaining O2  ,there are mainly two types  of respiration.

  1. Aerobic Respiration ( occurs in  the presence of O2 )

  2. Anaerobic Respiration ( occurs in the absence of  O2 )

1.Aerobic Respiration

 :-Respiration that occurs in the presence of of oxygen is called aerobic respiration.
→ It takes place inside the mitochondria .
→ Most of the living organisms carry out aerobic respiration(by using  O2 of air).
→ Single glucose molecule produces 38 molecules of ATP during aerobic respiration.
→ Complete oxidation of glucose takes place in this process.
➤ Reaction:-
 Step - 1, Formation of  Pyruvate or Pyruvic acid from glucose by the process of glycolysis      in cytoplasm.
    C6H12O6 ⟶ 2CH3COCOOH
Step - 2 , Formation of CO2 , H2O  and ATP( ENERGY ) from Pyruvate  in mitochondria in the presence of O2 . 
*Reaction👇                            2CH3COCOOH ➞  2CO2 + 2H2O + 38 ATP ⇈
Note:- 
(i) Glycolysis - The oxidation of glucose to pyruvic acid is called glycolysis.
(ii) Kreb's Cycle :- The step wise cyclic process which is used to oxidize the pyruvate formed during the glycolytic breakdown of glucose into CO2  and H20 is called Kreb's cycle.