Reincarnation of Energy in Living Organisms

Vera Hadjimitova


            Nearly all living organisms derive their energy, directly or indirectly, from the radiant energy of sunlight. There exist two large cycles of energy and of matter in animated nature. Photosynthetic cells absorb light energy and use water and carbon dioxide, forming energy-rich products such as glucose and releasing oxygen into the atmosphere. Nonphotosynthetic cells and organisms obtain the energy by oxidizing the energy-rich products of photosynthesis and then they form water, carbon dioxide, and other end products. The energy and matter cycles draw energy from Sun. The central role in cell energy metabolism haves ATP. ATP is the shared chemical intermediate linking energy-releasing to energy-requiring cell processes. Its role in the cell is analogous to that of money in an economy: it is „earned/produced” in exergonic reactions and „spent/consumed” in endergonic ones. The aim of this paper was to show energy transfers in living organism from the point of view of a physicist.