From Einstein's equation E=m c^2, you have learned in...

From Einstein's equation $E=m c^2$, you have learned in physics that mass and energy are interconvertible. Why can we say that mass and energy are conserved in physiological systems? What does it mean to say that living things "transform" matter and energy?

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Key Concepts

Mass-Energy Equivalence

This concept, stemming from Einstein’s equation E = mc², demonstrates that mass can be converted into energy and vice versa. Although the direct conversion is typically negligible at the scale of physiological processes, it underpins the principle that mass and energy are two forms of the same entity, and changes in one are reflected in the other when all forms are accounted for.

Conservation of Mass and Energy

This principle asserts that the total amount of mass-energy in an isolated system remains constant, even though energy or matter can change forms. In physiological systems, the biochemical processes and chemical reactions that occur only transform matter and energy, meaning that while the forms of these entities change, their overall total in the system is conserved.

Transformation of Matter and Energy

In living organisms, ‘transformation’ refers to the conversion of matter (like nutrients) into energy (such as ATP) and vice versa during metabolic processes. This transformation involves breaking and forming chemical bonds, ensuring that while the physical and chemical forms of matter and energy are radically changed to sustain life, the underlying conservation laws are respected.

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