This type of coma is usually reversible once the blood sugar is corrected. Oxygen deprivation: Oxygen is essential for brain function. Cardiac arrest causes a sudden cutoff of blood flow and oxygen to the brain, called hypoxia or anoxia.
The external power supply is the AC power adapter that converts household AC electricity voltages to the much lower DC voltages needed to charge a mobile phone's internal battery.
External regulators are proteins that respond to events outside the cell. These proteins direct cells to speed up or slow down the cell cycle, like traffic lights. For exampleâ¦, growth factors are one of the most important external regulators, and they stimulate the growth and division of cells. These differ from internal regulators in the fact that they respond to events inside the cell.