Glycolytic system Flashcards
1
Q
When does the glycolytic system kick in
A
The glycolytic system kicks in during high intensity activity after the first ten seconds of intense activity exhausts PC stores and ATP levels fall
2
Q
What is the process of the glycolytic system
A
- glycogen -(GPP)–> Glucose -(PFK)–> pyruvic acid -(LDH)–> lactic acid energy + 2P + 2ADP + 2ATP
1) ATP and P levels rise again and trigger the release of phosphofructokinase(PFK) an enzyme which catalyses the breakdown of the next available fuel(glucose)
2) If glucose levels dip, glycogen phosphorylase(GPP) an enzyme that catalyses the breakdown of stored glycogen is released converting glycogen into glucose
3) The breakdown of glucose in the absence of oxygen is through a process called anaerobic glycolysis and results in the production of pyruvic acid
4) Lactate dehydrogenase(LDH) is released which is an enzyme which catalyses the conversion of pyruvic acid into lactic acid,which accumulates and slows ATP resynthesis
3
Q
What is the type of reaction
A
Anaerobic
4
Q
What is the site of reaction
A
Sarcoplasm
5
Q
What is the food fuel used
A
Glycogen/glucose
6
Q
What are the controlling enzymes
A
GPP glucose phosphorylate, PFK phosphofructokinase, LDH lactate dehydrogensase
7
Q
What is the ATP yield
A
- 2:1
- 2 moles of ATP 1 mole of glycogen yields
8
Q
What is the by product
A
Lactic acid
9
Q
What is the intensity of activity
A
High intensity
10
Q
What is the duration of the system
A
Up to three minutes depending on intensity
11
Q
sporting example
A
800m runner
12
Q
What are the strengths
A
- No delay for oxygen and large fuel stores in the liver,muscles and blood stream
- Relatively fast fuel breakdown for ATP resynthesis
- Provides energy for high intensity activities for up to three minutes
- Lactic acid can be recycled into fuel for further energy production
13
Q
-ves
A
- fatiguing by-product lactic acid, reduces pH + inhibits enzyme production
- relatively low ATP yield + recovery can be lengthy
