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PPT - Respiration in Organisms Notes | Study Science Class 7 - Class 7

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 Page 1


CHAPTER - 10 
 
RESPIRATION IN ORGANISMS 
Page 2


CHAPTER - 10 
 
RESPIRATION IN ORGANISMS 
1) Why do we respire ? 
    We respire to get energy from food. Food contains stored 
energy.  When we respire  the food is broken down in the 
cells of our body with the help of oxygen and energy is 
released. 
 Respiration :- is the process by which food (glucose) is 
broken down in the cells of the body with the help of 
oxygen to release energy. 
   Since respiration takes place in the cells of the body, it is 
called cellular respiration. 
 
Glucose + Oxygen           Carbon dioxide 
                                       + Water + Energy 
Page 3


CHAPTER - 10 
 
RESPIRATION IN ORGANISMS 
1) Why do we respire ? 
    We respire to get energy from food. Food contains stored 
energy.  When we respire  the food is broken down in the 
cells of our body with the help of oxygen and energy is 
released. 
 Respiration :- is the process by which food (glucose) is 
broken down in the cells of the body with the help of 
oxygen to release energy. 
   Since respiration takes place in the cells of the body, it is 
called cellular respiration. 
 
Glucose + Oxygen           Carbon dioxide 
                                       + Water + Energy 
2) Types of respiration :- 
    There are two types of respiration. They are aerobic 
respiration and anaerobic respiration. 
i) Aerobic respiration :- is respiration in which glucose is 
broken down in the presence of oxygen to release carbon 
dioxide, water and energy. It takes place in most organisms. 
                   Presence of oxygen 
   Glucose                                             carbon dioxide  +  water  +  energy 
ii) Anaerobic respiration :- is respiration in which glucose is 
broken down in the absence of oxygen to release alcohol, 
carbon dioxide and energy. It takes place in yeast. 
                       Absence of oxygen 
  Glucose                                             alcohol  +  carbon dioxide  +  energy 
    In anaerobic respiration in our muscle cells glucose is 
broken down in the absence of oxygen to release lactic acid 
and energy. 
                      Absence of oxygen 
  Glucose                                             lactic acid  +  energy 
Page 4


CHAPTER - 10 
 
RESPIRATION IN ORGANISMS 
1) Why do we respire ? 
    We respire to get energy from food. Food contains stored 
energy.  When we respire  the food is broken down in the 
cells of our body with the help of oxygen and energy is 
released. 
 Respiration :- is the process by which food (glucose) is 
broken down in the cells of the body with the help of 
oxygen to release energy. 
   Since respiration takes place in the cells of the body, it is 
called cellular respiration. 
 
Glucose + Oxygen           Carbon dioxide 
                                       + Water + Energy 
2) Types of respiration :- 
    There are two types of respiration. They are aerobic 
respiration and anaerobic respiration. 
i) Aerobic respiration :- is respiration in which glucose is 
broken down in the presence of oxygen to release carbon 
dioxide, water and energy. It takes place in most organisms. 
                   Presence of oxygen 
   Glucose                                             carbon dioxide  +  water  +  energy 
ii) Anaerobic respiration :- is respiration in which glucose is 
broken down in the absence of oxygen to release alcohol, 
carbon dioxide and energy. It takes place in yeast. 
                       Absence of oxygen 
  Glucose                                             alcohol  +  carbon dioxide  +  energy 
    In anaerobic respiration in our muscle cells glucose is 
broken down in the absence of oxygen to release lactic acid 
and energy. 
                      Absence of oxygen 
  Glucose                                             lactic acid  +  energy 
3) Breathing :- 
    Breathing is the process by which oxygen rich air is 
taken in and carbon dioxide rich air is given out with the 
help of the respiratory organs. 
   The taking in of air rich in oxygen is called inhalation. 
   The giving out of air rich in carbon dioxide is called 
exhalation. 
  Breathing rate :-The number of times a person breathes in 
a minute is called the breathing rate. (Number of breaths 
per minute) 
   When a person needs more energy, he breathes faster, 
more oxygen is supplied to the cells, more food is broken 
down and more energy is released.    
Page 5


CHAPTER - 10 
 
RESPIRATION IN ORGANISMS 
1) Why do we respire ? 
    We respire to get energy from food. Food contains stored 
energy.  When we respire  the food is broken down in the 
cells of our body with the help of oxygen and energy is 
released. 
 Respiration :- is the process by which food (glucose) is 
broken down in the cells of the body with the help of 
oxygen to release energy. 
   Since respiration takes place in the cells of the body, it is 
called cellular respiration. 
 
Glucose + Oxygen           Carbon dioxide 
                                       + Water + Energy 
2) Types of respiration :- 
    There are two types of respiration. They are aerobic 
respiration and anaerobic respiration. 
i) Aerobic respiration :- is respiration in which glucose is 
broken down in the presence of oxygen to release carbon 
dioxide, water and energy. It takes place in most organisms. 
                   Presence of oxygen 
   Glucose                                             carbon dioxide  +  water  +  energy 
ii) Anaerobic respiration :- is respiration in which glucose is 
broken down in the absence of oxygen to release alcohol, 
carbon dioxide and energy. It takes place in yeast. 
                       Absence of oxygen 
  Glucose                                             alcohol  +  carbon dioxide  +  energy 
    In anaerobic respiration in our muscle cells glucose is 
broken down in the absence of oxygen to release lactic acid 
and energy. 
                      Absence of oxygen 
  Glucose                                             lactic acid  +  energy 
3) Breathing :- 
    Breathing is the process by which oxygen rich air is 
taken in and carbon dioxide rich air is given out with the 
help of the respiratory organs. 
   The taking in of air rich in oxygen is called inhalation. 
   The giving out of air rich in carbon dioxide is called 
exhalation. 
  Breathing rate :-The number of times a person breathes in 
a minute is called the breathing rate. (Number of breaths 
per minute) 
   When a person needs more energy, he breathes faster, 
more oxygen is supplied to the cells, more food is broken 
down and more energy is released.    
4) How do we breathe ? 
    The respiratory system helps in breathing. The main parts of the 
respiratory system are nostrils, nasal cavity, wind pipe, lungs and 
diaphragm. 
   Breathing involves the rib cage and a muscular sheet  below the chest 
cavity called diaphragm.  
   During inhalation (breathing in) the chest cavity increases in size and 
the diaphragm moves down and air enters into the lungs. During 
exhalation (breathing out) the chest cavity reduces in size and the 
diaphragm moves up and air is pushed out of the lungs. 
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