These 10 animal facts will amaze you. The face of farming and agriculture has changed drastically over the past 100 years. At the beginning of the 20th century, over 70% of the population of the United States lived and worked on farms, but by 2008, the figure had dropped to less that 3%.
During this process, glucose from food is broken down into carbon dioxide and water, and energy is released. The process of releasing energy from food is called respiration, or cellular respiration as it is a series of steps that take place within living cells. It is important to not confuse respiration, or oxidizing glucose, with breathing.
Most of the enzymes involved in the process of aerobic cellular respiration are found in the mitochondria. The process starts out the same as anaerobic respiration. Glucose is broken into 2 PGAL with the help from 2 ATP and then the PGAL is converted into 2 Pyruvic acid and 4 ATP are made. Hydrogen's come off the glucose as it is being broken down and are accepted by NAD. This process so far is called glycolysis and is considered the anaerobic phase of aerobic respiration.