ANATOMY

Detailed explanation-1: -When the amount of ATP is available in excess of the body’s requirements, the liver uses the excess ATP and excess glucose to produce molecules called glycogen. Glycogen is a polymeric form of glucose and is stored in the liver and skeletal muscle cells.

Detailed explanation-2: -Glucose is the main source of fuel for the brain and nervous system. Nerve cells and chemical messengers need glucose to process information. On the other hand, the liver and muscles can store the leftover glucose in little bundles called glycogen once the human body has used all the energy it needs.

Detailed explanation-3: -Any excess glucose ends up being stored as glycogen in the muscles, and it can also be stored as lipid in the fat tissue. Fructose is also taken up into the blood from the gut, but in this case, the liver serves as a pre-processing organ that can convert fructose to glucose or fat.

Detailed explanation-4: -Glucose and other food molecules are broken down by controlled stepwise oxidation to provide chemical energy in the form of ATP and NADH.

Detailed explanation-5: -The stomach and small intestines absorb the glucose and then release it into the bloodstream. Once in the bloodstream, glucose can be used immediately for energy or stored in our bodies, to be used later. However, our bodies need insulin in order to use or store glucose for energy.