Page 160 - The Miracle in the Cell
P. 160

THE MIRACLE IN THE CELL


                                       Figure 8.4

                                        Inner membrane              Cytoplasm
                                                            Outer      Outer
                                                         compartment   membrane

                                        Inner compartment
                                         of mitochondria







                                                       Inner membrane

                                                                            (b)
                                        Pyruvic acid
                                       from cytoplasm
                                                                       Electron
                                                      NADH             transport
                                          Acetyl CoA                   system
                                                               FADH 2
                                             Krebs    NADH
                                             cycle
                                                      ATP
                                                                  H +
                                                  MANY ATP          2e
                                                            H 2 O        O 2
                                          ATP synthetase
                                            enzyme
                                          Inner                     Outer
                               (a)        compartment               compartment
                                         Figure 8.5
                                                                            (c)




                Figures 8.4 and Figure 8.5       place. NAD and FAD are converted
                The functional compartments of the  into NADH and FADH2 by reacting
                mitochondrion                    with H+ and electrons. These are sent
                a) Mitochondrion from the pancreatic  to the transport system in the inner
                cell of a bat                    membrane. The concentration of H+
                b) The membrane in the inner com-  ions and electric charge changes as a
                partment of the mitochondrion    result of the processes that take place
                divides up the organelle into two  in the third stage. As a result of these
                regions.                         changes and the effect of the ATP
                c) The inner region is where the sec-  enzyme (ATP synthetase), ATP is pro-
                ond stage of aerobic respiration  duced.
                (including the Krebs cycle) takes



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