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.
Glucose Metabolism. Two different pathways are involved in the metabolism of glucose: one anaerobic and one aerobic. The anaerobic process occurs in the cytoplasm and is only moderately efficient. The aerobic cycle takes place in the mitochondria and is results in the greatest release of energy.As the name implies, though, it requires oxygen. However, red blood cells do not have mitochondria, so they change glucose into energy without the use of oxygen. 2  Glucose is also converted to energy in muscle cells â which are probably the most important energy âcustomers.â These muscle cells do contain mitochondria, so they can process glucose with oxygen.