Phosphogen System (System 1) Flashcards
What is another name for System 1?
Phosphagen System
What is the only enzyme that reacts in this system?
Creatine Kinase
What does PCr stand for?
Phosphocreatine
ATP in the Phosphagen system is _________ and occurs in _________ to reform ATP from Phosphocreatine. What is this process called?
limited; cytosol; Phosphorylation
Fill in the blanks of this chemical reaction:
____ + ADP ——_______ _______(enzyme) ——> ____
Which system is this?
PCr; Creatine Kinase; ATP
System 1
How long does ATP last in the cell, alone?
2 - 3 seconds
How long does ATP last in conjuction with PCr?
10 - 12 seconds
What does the Shuttle Hypothesis state?
That the majority of ATP is created in the Mitochondria and that the reverse CK reaction transfers a phosphoryl group to produce Phosphocreatine (PCr)
True or False: There is an unlimited amount of PCr.
False, there is a limited amount.
How does the Phosphagen System work?
PCr diffuses to the myofibrils to convert back to ATP via CK reaction to power muscle contraction. Cr diffuses (DCr) back to the Mitochondria to complete the cycle.
__________ + __________ _____________ maintains ATP during moderate exercise.
Glycolysis + Oxidative Phosphorylation
ATP + H2O ——–> (_______) —>ADP + Pi
ATPase
ADP + PCr ———> (______________)—>ATP + Cr
What does this help out with?
Creatine Kinase;
Helps maintain ATP during intense exercise
