Regulation of Pathways

Concentrations of Substrates/Products

Now it's time to try to put the previous two modules together. It easiest to think about this process if we consider two extreme cases throughout this module.

1. An indivual at rest, just having consumed a pound of m&m's (what else could you do at this point?)
2. An active individual, half way through a marathon running race

In the first case there are obviously plently of sugar molecules in his system. Furthermore the lack of activity will mean that the concentration of ATP in his muscle cells is high (relative to ADP). In the second case you can well figure that his glycogen stores are both in the liver and in muscles are well depleted so sugars are in short supply. The high level of activity also means that realtively speaking the concetrations of ATP are low.