AP BIOLOGY

Detailed explanation-1: -This leaves the by-products of ATP breakdown: adenosine diphosphate (ADP) and one single phosphate (Pi) all on its own. 3. The energy released in the breakdown of PC allows ADP and Pi to rejoin forming more ATP. This newly formed ATP can now be broken down to release energy to fuel activity.

Detailed explanation-2: -The ATP-PC system produces 1 molecule of ATP at a very fast rate. Glycolysis produces 2 molecules of ATP for every molecule of glucose.

Detailed explanation-3: -The ATP-PC system uses a stored molecule in the muscle called creatine phosphate (CP) to resynthesise ATP. It is the breakdown of this molecule that releases the energy needed to rejoin the ADP and free phosphate to form ATP. This system is anaerobic as it works without oxygen, and does not produce any waste products.

Detailed explanation-4: -By-products of energy production – The aerobic system produces water and carbon dioxide as by-products in its production of ATP.

Detailed explanation-5: -This system allows the body to work in a steady state – the muscles work below maximal effort and keep this going for a long period of time. Carbon dioxide and water are produced as by-products.