Pretty good information in general but I don't like the way they describe cell metabolism. Many of their statements are either wrong or misleading.
"ATP converting to another powerful molecule, adenosine diphosphate (ADP)" - When cells use the energy in ATP they are removing one of the P's (either transferring it to another molecule or just releasing it). The end result is the release of energy and ADP which they can then convert back to ATP to store energy again. ADP IS another high energy molecule but it is rarely used to release energy. What the cell does is use the energy in glucose to add another "P" to ADP to make more ATP so if there is not enough ADP around they can't make enough ATP.
" In order to release more ATP, your cells begin to break down glycogen, a form of glucose (fuel) stored in your muscles" - A better way to say this is "In order to make more ATP, your cells ..." Cells use glycogen to make more ATP by adding another "P" to ADP. Cells don't "release" ATP, they use the energy it holds so they can carry out essential chemical reactions.
"As your body uses more glucose and your muscles unleash lactic acid (also known as 'the burn'), your brain will alert you that you're under physical stress" - Cells don't make lactic acid because they are using more glucose. They make lactic acid because they are not getting enough oxygen. When cells break down glucose they use the energy to make ATP. They also make an important compound called NADH by adding a hydrogen molecule to NAD. In order to keep that process going they have to remove the "H" to make NAD again (just like they need to have ADP to make more ATP). If they have oxygen around they use the NADH to make even more ATP. However, if they don't have enough oxygen they have to use the NADH to make something else so they have enough NAD to keep burning glucose. That something else is to make lactic acid.
"You will be fighting the oxygen-producing process. Lactic acid will begin to overwhelm your body, making each minute more cumbersome than the last. Keep pushing" - There is no "oxygen-producing process". Only plants, algae and cyanobacteria produce oxygen. What is happening in our cells is an oxygen "using" process. As explained above, when there is not enough oxygen available then they will use something else which ends up making lactic acid.
DOUG, ATP doesn't release energy the way TNT does so it is not explosive like TNT. The energy in ATP is released through enzymatic reactions which require proteins able to remove the P and transfer it to another molecule.
Edited by: GREENGENES at: 3/3/2013 (12:46)
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