Ce Lesson 2 ch Respiration and its meaning Dr. Praveen Kumar Agrawial M.Sc, Ph.D., CSIR NET (JRF), SRF, GATE, FIAZ Youtube Channel with over 1 million views 20 Years of Pre-medical teaching experience Ex- Faculty, Allen Career Institute, Kota Visit following link to follow my profile https:/lunacademy.com/user/biologybypkagrawal-6909
Need of respiration Energy is the capacity to do work. All living organisms re quire energy for their survival. All their activities such as metabolism, growth, re pair, development and movement re quire energy. About 50% of the energy produced by the cell . IS Utilized in these cellular activities and rest is changed to heat or gets lost Organisms obtain energy from food, which they eat. The food in the body undergoes oxidation to release energy. . This process offood-oxidation is called respiration. . The process of this oxidation takes place inside the cell and therefore it is called cellular respiration. .The compounds of the food that are oxidized during respiration are called respiratory substrates. The most important respiratory substrate is the glucose (carbohydrate)
Definition of respiration Basic mechanism of respiration can be expressed by following equation C6H1206 (Carbohydrates) . Respiration can therefore be defined as the enzymatically controlled, catabolic, 6026CO2 + 6H20 Energy (Respiration in mitochondria) exothermic process. It involves the stepwise oxidation of the food material inside the living cell. .The process occurs in all living cells including those of bacteria, fungi, animals and even in photosynthetic plants (autotrophs)
Basic concept of respiration According to first law of thermodynamics, energy can not be created and can not be destroyed . So, we can only convert one kind of energy into another kind and vice versa. Plants use sunlight as the main source of energy and they convert this solar energy into the chemical energy of the biomolecules in the form of food. This process is called photosynthesis . But animals can not directly use sunlight. So, in order to obtain energy they take food. When food (after digestion) goes into the cells, the process of harnessing the energy in the food molecules begin inside the cell. This process is called respiration. . So, photosynthesis is reduction process, whereas respiration is an oxidative process. . The energy liberated in respiration is stored in the form of energy currency called ATP
Respiration Vs Combustion Respiration and combustion are two different processes. However, process of respiration can be compared with the simple combustion of organic fuel, outside the living body. During combustion the organic fuel is oxidized with the help of oxygen. During this process, CO2 is evolved and energy is released. . Similarly in cellular respiration, there is the oxidation of fuel (usually with the help of oxygen) and CO2 is produced with the release of energy. . However, respiration is a biological process that can occur only inside a living body or living cell. Combustion on the other hand, is a non biological process
Differences between respiration and combustion Cellular respiration Combustion Occurs inside the cell It is a biochemical reaction It is enzymatically controlled It involves stepwise oxidation Does not produce flame Light is normally not produced Temperature remains constant during the process It may occur in aerobic or anaerobic conditions Energy produced is utilized to form ATP Many intermediary substances are formed Non-cellular phenomenon It is physico-chemical reaction It is not controlled by enzymes It is single stepped process Normally flame is produced Light is produced Temperature becomes very high It occurs always in the presence of oxygen No ATP is formed No intermediary substance is formed
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