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Which process occurring in human body does not involve energy from respiration?

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Which process occurring in human body does not involve energy from respiration? 

A. contraction of heart muscle 

B. Diffusion of oxygen from the alveoli into the blood 

C. Digestion of bread 

D. Maintaining a constant body temperature

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Contraction of heart, digestion and homeostasis (maintaining a constant body temperature) requires a lot amount of energy while diffusion is a passive process which occurs according to the concentration gradient. Thus it do not require energy expenditure.

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