Ketosis occurs when the body does not have any glucose stores left. So it has to switch to some other process to get energy. One process is gluconeogenesis in which the body creates glucose from fat/protein. The other is ketosis which is literally referes to the creation of ketone bodies from fat/protein.
C'mon Baby, Light My Fire. The ingredients needed to start a fire are traditionally illustrated in the fire triangle. The three legs of the triangle are fuel, oxygen and heat. When enough of these three factors is present, a chemical reaction occurs that results in fire. This is why you can start a fire with two sticks: The fuel is the sticks, the oxygen comes from the air and fiction provides the necessary heat. But this is far from the only circumstance in which friction starts a fire.
Fire is a very rapid chemical reaction between oxygen and a combustible material, which results in the release of heat, light, flames, and smoke. For fire to exist, the following four elements must be present at the same time: 1  Enough oxygen to sustain combustion. 2  Enough heat to raise the material to its ignition temperature. 3  Some sort of fuel or combustible material.  The chemical reaction that is fire.