It helps the protection of a body organ let's simplify this a little bit an organ can not just stay in your body fat is a place holder so everything doesnt swish around if you know what i mean. so fat buildes up around organs, tissue, and bones to protect them from harm.
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The lungs hold air that is breathed in. Oxygen gas in the air moves into the blood. The heart pumps to transports this oxygenated blood to cells in the body that need it to produce energy. Hope This Helps! :)<span>
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Energy production depends on metabolic pathway and ATP yield, with fats having the highest ATP yield with ketone bodies,followed by Carbohydrates then proteins.
Energy produced by one glucose molecule yields final ATP of 5-7 through glycolysis and 17-25 through citric cycle.
Proteins energy prooduction is considered to be more healthy because unlike fats and carbohydrates they are not stored but used up immediately by the body.
I hope this is will help