noun. The transfer or exchange of energy from one body or system to another; (as a count noun) an instance of this.
Simply so, do humans exchange energy?
In a living organism 72% of energy exchange occur in the visceral organs, which comprise only 5-6% of the total body mass. The remaining energy is spent at the expense of the skin, bones, connective tissues, resting muscles.
Thereof, how does energy trading work? Electricity is generated at power stations, then bought by suppliers, who then sell it on to meet the needs of the consumers. Electricity trading refers to the transaction between power generators, who produce electricity, and power suppliers, who sell it on to consumers.