2: Introduction to Energy Systems Flashcards
how much energy does the body require?
the body requires a continuous supply of energy. can live for several days on stored but needs to eat or death
what happens to energy stores during exercise?
bodily rapidly uses it, rate of exercise depends on the ability of the body to replenish energy stores. if cant match demand, exercise will slow
how is gibbs free energy expressed?
-7.3 kcal * mol -1
what is the ATP pool?
the bodys small store of ATP ready for 1-3 seconds of work. although small, does provide the most rapid ready available source of energy
what are the two pathways to maintain ATP production and what are their systems?
Anaerobic - PCr and glycolysis Aerobic - oxidative phosphoralisation
Although PCr is the star of the show, what is another reaction system at work?
adenylate kinase reaction
- ADP +ADP = ATP +AMP
Together PCr and adenylate kinase help maintain immediate ATP stores (both water soluble and occur in cytosol of cell.
how long can PCr and adenylate kinase provide energy for?
5-15 seconds during maximal exercise
how is glycolysis different to PCr?
it takes a longer time to generate ATP due to the many reactions and uses glucose or more complex glycogen
how long can glycolysis provide ATP for?
30s to a minute
what does the kreb cycle do?
it does create a lot of substrates which creates many more reactions
oxidative phosphoralisation is the slowest of all systems and provides the greatest amount of ATP
Only occurs in the mitochondria
only system to use intermediate from fat metabolism
which is the first cycle to start?
they all start at the same time
where does ATP go?
muscle contraction
glandular secretion - hormones
nerve activity
circulation
does atp cause the contraction directly?
no. it loads myosin to a ready state and promotes the release from actin myofilament
does atp cause the contraction directly?
no. it loads myosin to a ready state and promotes the release from actin myofilament
