Question

Please explain in detail....RESPIRATION glycolosis krebs cycle and other processes

Answer 1

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Answer 2

Respiration is the bodily process of inhalation and exhalation. It is the process of taking in oxygen and releasing carbon dioxide. The process involves the consumption of oxygen and liberation of carbon dioxide and water.

The oxygen inhaled is used to burn/oxidize/break down the food (glucose). This reaction produces energy required for all activities. Water and carbon dioxide are by-products of this reaction. This process occurs inside the mitochondria and is called cellular respiration. It is exactly opposite to the process of photosynthesis. It can be represented as:



Thus, cellular respiration is the process by which energy is released from the breakdown of organic substances (glucose).

Glucose is the simplest molecule that enters a series of reactions called Glycolysis and the Krebs cycle to produce energy.

Aerobic respiration: It involves four main steps:



Step 1: The first step is called glycolysis. It occurs in the cytoplasm of a cell. It does not require oxygen. Here, the 6-carbon molecule glucose is partially broken down into a 3-carbon molecule, pyruvate or pyruvic acid. In this step, one glucose molecule produces 2 molecules of pyruvate.

Glucose 2 Pyruvate

Step 2: The two pyruvic acid molecules are converted into acetyl CoA, which can easily enter the mitochondria, which is the site for further reactions.

Step 3: These acetyl CoA molecules enter the mitochondrial matrix and take part in the Krebs cycle. This occurs in the presence of O2.

You will study more about it in higher classes. Further classification is beyond the scope of your standard.

Step 4: In this step, the energy released in all the above steps is converted to ATP by ATP synthase enzyme.

In aerobic respiration, a total of 36 ATP molecules are produced from one molecule of glucose.

Further detail is beyond the scope of your standard. You will study more about it in higher classes.