Oxidative phosphorylation
The production of ATP using energy derived from the redox reactions of an electron
transport chain.
Oxidizing agent
The electron acceptor in a redox reaction.
Oxygen debt
In muscle, the cumulative deficit of oxygen that develops during strenuous exercise when
the supply of oxygen is inadequate for the demand; ATP is produced anaerobically by
glycolysis, and the resulting pyruvic acid is converted to lactic acid, which is subsequently
metabolized when adequate oxygen is available.
Oxysomes/F1 particles.
Oxysomes are also called elementary particles or F 1 particles. They helpful in the electron
transport of respiration that is in oxidation and reduction reactions.
P
Pacemaker
A specialized region of the right atrium of the mammalian heart that sets the rate of
contraction; also called the sinoatrial (SA) node.
Pachytene
The third stage of the prophase of meiosis during which the homologous chromosomes
become short and thick and divide into four distinct chromatids.
Paedogenesis
The precocious development of sexual maturity in a larva.
Paedomorphosis
The retention in an adult organism of the juvenile features of its evolutionary ancestors.
Paleontology
The scientific study of fossils.