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How is Energy Used in the human Body? 5 Important Ways

Energy is the foremost requirement for any living or non living thing & also for every action in the universe.  Energy is so important to the body that it doesn’t survive even a minute without it. Cyanide is so powerful in causing quick death due to this is reason. It causes rapid energy failure leading to immediate death (mitochondria arrest). Even during sleep huge amounts of energy is consumed by the body. Thus human body is so dependent on energy for various purposes each and every second and below is an idea of how is energy used in the body.

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How is Energy Used in the human Body:

Body energy consumption is by the following ways viz.

1. Physical exertion or by voluntary movements.

2. Mental exertion or mind activity.

3. Physiological functions of the body.(involuntary activity).

4. Body cellular metabolic and synthetic reactions.

5. Energy lost by dissipation or non specific purposes.

Physical exertion: This is the way most of the energy of the body is spent in living and motile animal bodies including humans. This is done human or animal intention to move or perform. This may not be seen in plants. The body energy is consumed for muscle contractions and relaxation during walking, running, lifting, jumping, talking, shouting etc.

Mental exertion: This is the next way how energy is used in especially higher animals like humans. Good amount of energy is consumed for thinking, learning, memorizing, anxiety and other behavior related mental functions. Body first tries to fill up this energy need more than other energy needs.

Physiological functions: All the physiological functions like heart breath, lungs (inspiration & expiration), stomach and intestinal contractions etc require constant supply of energy. These are involuntary in nature without the intention of the animals.

Body metabolic and synthetic reactions: Most of the body cell reactions like formation of proteins (translation), multiplication of genes, formation of genes, transport of slats, nutrients into cell, degradation of waste material (metabolism) require energy.

Energy lost by dissipation: Energy is also dissipated from the body in the form of heat. Body tries to maintain constant fixed temperature to keep up the physiology, This temperature is generated by burning calories in muscles. Ambient temperature is necessary for action of enzymes, hormones and other reaction to take place.


The energy available for all the body function is in the form of ATP (adenosine di phosphate) and energy is also lost through sweat, gaseous exchange during respiration, during excretion by urine etc.

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