Adenosine Triphosphate ( Atp ) Essay examples
At the start of the race, anaerobic pathways are used to provide a quick source of energy. Most of this energy is derived from the catabolism of fats. Since lipids are more reduced than carbohydrates, they are capable of storing more energy per unit weight. Triacylglycerols are the lipids used for energy storage. They are comprised of three fatty acids linked to a glycerol molecule. Triacylglycerols are stored by animals in adipocytes, which collectively make up adipose tissue, and also in the liver.
Mobilisation of triacylglycerols is important in the hours between a meal. Low glucose levels cause the release of hormones (glucagon) which stimulate fatty acid release in adipocytes. The enzyme triacylglycerol lipase breaks triacylglycerols down into fatty acids and glycerol. The blood protein, serum albumin, then carries fatty acids through the bloodstream. Glycerol is transported to the liver for further metabolism. The fatty acids are carried to tissues such as the skeletal muscle, the heart and the renal cortex. Having entered the muscle cells, the fatty acids are now able to be oxidised to provide energy for the cell.
The fatty acids must enter the mitochondria in order to be oxidised. For this to occur, they must first be converted to fatty acyl-CoA. Since the fatty acyl-CoA cannot…