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| Description: In most aerobic cells the level of ATP exceeds that of ADP by 4- to 10-fold. It is convenient to think of respiratory control as a dependence of respiration on ADP as a substrate for phosphorylation. If the energy demands on a cell cause ATP to be consumed at high rates, the resultant accumulation of ADP will stimulate respiration, with concomitant activation of ATP resynthesis. Conversely, in a relaxed and well-nourished cell, ATP accumulates at the expense of ADP, and the depletion of ADP limits the rate of both electron transport and its own phosphorylation to ATP. Thus, the energy-generating capacity of the cell is closely attuned to its energy demands. Picture Stats: Views: 249 Filesize: 19.8kB Height: 283 Width: 689 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34591 |