Transcript B. Muscle metabolism - Crestwood Local Schools

B. Muscle metabolism
1. Use ATP but little is readily available
a. When active more must be
produced
2. Phosphagen system
a. In muscle there is creatine
phosphate which can transfer high
energy phosphate groups to ADP
b. Creatine phosphate is 3-5 x’s
more abundant that ATP
c. Produce enough energy to go all
out for 15 seconds
d. Reaction requires high water
and make carbon dioxide so this
must be accounted for
3. Glycogen-lactic acid cycle
a. Next glucose would be
catabolized
1. Broken into pyruvic acid
through anaerobic process of
glycolysis
2. Would normally be
oxidized in high ATP but not
enough oxygen available
b. The fermentation process of
producing lactic acid would then
occur
1. 80% goes into the blood
where the heart, liver and
kidney can make ATP from it
a. liver can also make it
back into glucose
2. Other 20% stays in the
muscle
a. Can give 30 – 40
seconds of all out
contractions
b. Is acid that damages
muscle though
c. Depending on the
degree, can take several
days to recover