...take nice deep breaths ( हवा ) to produce 36 instead of just 2 ATPs from each molecule of glucose!

P.S. ...glucose in blood undergoes Glycolysis (Glucose to Pyruvate - 2 ATPs) for energy production further down the pathway.

...Then, Oxidation of Pyruvate (Pyruvate to Acetyl CoA) occurs to enter Citric Acid Cycle.

...Within the Citric Acid cycle (8 steps) for production of energy (2 ATPs) (Acetyl CoA to Citrate) and

...further in a series of steps, citrate is oxidized, releasing two carbon dioxide molecules for each acetyl group fed into the cycle releasing 34 ATPs.

...Total 38 ATPs are produced but 2 ATPs are consumed in the process.

...in the presence of Oxygen net 36 ATPs are produced where as in absence  of Oxygen (Pyruvate to Lactate) only 2 ATPs are produced.

...Therefore, aerobic metabolism is generally 18 times more efficient in producing energy.

...it is through Cori cycle (Lactate e.g. of Ringer Lactate) forms into glucose in the liver. For this to happen blood circulation must be good with good blood pressure and the liver function must be normal.

Further Titbits:

1 atp is equal to how many kcal?
"One mole of ATP stores 7.3 kcal of energy."

The energy used by human cells requires the hydrolysis of 100 to 150 moles of ATP daily, which is around 50 to 75 kg. A human will typically use up his or her body weight of ATP over the course of the day. Each equivalent of ATP is recycled 500 - 750 times during a single day (100 / 0.2 = 500).

On average, a man has a metabolic rate of approximately 1 kcal per hour per kilogram of mass. For women it is 0.9 kcal/kg/hour. A man, who weighs 45 kg (100 pounds), has a rate of 45 kcal per hour. Therefore, in a day about 1200 kcal.

The removal of the third phosphate of ATP releases 7.3 kcal per mole. This means, the above 45 kg man will need 45 kcal/7.3 = 6.21 moles of ATP per hour.

A mole is 6.23 x 10^23 molecules, which puts the total number of ATP molecules for the above man for each hour at approximately 3.87 x 10^24 molecules of ATP.

ATP = 2 from glycolysis, 2 from Krebs cycle, and about 34 from the electron transport system (cellular aerobic respiratory chain reaction) = total 38 ATPs.

The Cori cycle also called Lactic Acid Cycle, named after its discoverers, Carl Ferdinand Cori and Gerty Cori, refers to the metabolic pathway in which lactate produced by anaerobic glycolysis in the muscles moves to the liver to form glucose.

The citric acid cycle (CAC) – also known as the tricarboxylic acid (TCA) cycle or the Krebs cycle – is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins into carbon dioxide and chemical energy.

Breakdown of Pyruvate: In order for pyruvate, the product of glycolysis, to enter the next pathway, it must undergo several changes to become acetyl Coenzyme A (acetyl CoA). Acetyl CoA is a molecule that is further converted to oxaloacetate, which enters the citric acid cycle (Krebs cycle).

When glucose has been converted into G6P by hexokinase or glucokinase, it can either be converted to glucose-1-phosphate (G1P) for conversion to glycogen, or it is alternatively converted by glycolysis to pyruvate, which enters the mitochondrion where it is converted into acetyl-CoA and then into citrate.

The anaerobic glycolysis (lactic acid) system is dominant from about 10–30 seconds during a maximal effort. When sufficient oxygen is not present in the muscle cells for further oxidation of pyruvate and NADH produced in glycolysis, NAD+ is regenerated from NADH by reduction of pyruvate to lactate.

The citric acid cycle: In the citric acid cycle, the acetyl group from acetyl CoA is attached to a four-carbon oxaloacetate molecule to form a six-carbon citrate molecule. Through a series of steps, citrate is oxidized, releasing two carbon dioxide molecules for each acetyl group fed into the cycle.

https://www.quora.com/in/1-atp-is-equal-to-how-many-kcal

How many ATP's are produced in a human body?
https://www.quora.com/How-many-ATPs-are-produced-in-a-human-body

How many ATPs does a human body require?
https://www.quora.com/How-many-ATPs-are-produced-in-a-human-body

How many ATP molecules are produced with one glucose?
https://www.quora.com/How-many-ATP-molecules-are-produced-with-one-oxygen
Cellular respiration:
https://en.m.wikipedia.org/wiki/Cellular_respiration

Cori cycle: https://en.m.wikipedia.org/wiki/Cori_cycle

Citric acid cycle:
https://en.m.wikipedia.org/wiki/Citric_acid_cycle

Oxidation of Pyruvate and the Citric Acid Cycle:
https://courses.lumenlearning.com/boundless-biology/chapter/oxidation-of-pyruvate-and-the-citric-acid-cycle/

Glycolysis:
https://en.m.wikipedia.org/wiki/Glycolysis

Anaerobic glycolysis:
https://en.m.wikipedia.org/wiki/Anaerobic_glycolysis

Oxidation of Pyruvate and the Citric Acid Cycle:
https://courses.lumenlearning.com/boundless-biology/chapter/oxidation-of-pyruvate-and-the-citric-acid-cycle/

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