aerobic system Flashcards
What happens during the glycolysis
Glycogen–(GPP)–> glucose-(PFK)-> pyruvic acid-(coenzyme A)->Acetyl CoA
Where does glycolysis occur
In sarcoplasm
How long does glycolysis occur for
3 minutes
What happens during Krebs cycle
- Acetyl CoA -(oxaloacetic acid)->citric acid-(oxidised in)-> krebs cycle
- From krebs cycle co2 and H+H- comes off it
- Energy+2p+2ADP+2ATP(in matrix of mitochondria)
What happens during the electron transport chain
H ions are carried through the ETC-(oxidised-> H20–>releases enough energy to resynthesise 30 moles of ATP
H electrons are carried through the cristae of the mitochondria-(NAD+FAD)->FADH2+NADH2–>releases enough energy to resynthesise 4 moles of ATP
Overall the energy yield is 38 moles of ATP
What sports is electron transport chain suitable for
Marathons and cyclists
What intensity is electron transport chain at
Sub max/moderate intensity
Where is the site
Cristae of the mitochondria
Why are glycogen stores large
They are large to fuel aerobic system for a significant period of time
Why do endurance athletes want to preserve glycogen
Can be broken down both aerobically and anaerobically
What happens during beta oxidation
- triglycerides or fats can be metabolised aerobically as free fatty acids(FFAs).This provides a huge potential fuel store which conserves glycogen and glucose
- Lipase converts triglycerides into FFA’s and glycerol.FFA’s are converted into acetyl CoA
- FFA’s produce more acetyl CoA,therefore a higher energy yield,preferable so events lasting more than an hour.However FFA’s require 15% more O2 to metabolise
Pros of the aerobic system
- Large fuel stores;triglycerides,FFA’s,glycogen and glucose
- High ATP yield and long duration of energy production
- No fatiguing by-products
Cons of aerobic system
- Delay for O2 delivery and complex series
- Slow energy production limits activity to sub-maximal intensity
- Triglycerides or FFA’s demand around 15% more O2 for breakdown
