Aerobic energy system

Question 1

What form of activity is the aerobic system most dominant in

Answer 1

Aerobic

Question 2

What are the 3 phases of the aerobic system and their ATP output

Answer 2

1. Aerobic glycolysis (2 ATP)
2. Kreb cycle (2 ATP)
3. Electron transport chain (34 ATP)

Question 3

What is the process of the first stage of the aerobic system (aerobic glycolysis)

Answer 3

Same as lactic acid system but because O2 is available, pyruvic acid is catalysed with coenzyme A to form acetyl CoA

Question 4

What is the process of the second stage of the aerobic system (Kreb cycle)

Answer 4

Acetyl CoA combines with oxaloacetic acid to form citric acid. This enter the Kreb cycle and releases 2 ATP when oxidised, and hydrogen and CO2

Question 5

Summarise the first 2 stages of the aerobic system

Answer 5

Pyruvic acid + Coenzyme A = Acetyl CoA
Acetyl CoA +Oxaloacetic acid = Citric acid
Citric acid enters Kreb cycle and releases hydrogen, CO2 and 2 ATP

Question 6

What is the third stage of the aerobic system (ETC)

Answer 6

Released hydrogen atoms from stage 2 are carried to ETC by NAD and FAD. Split into H+/H- ions and removed as H2O when oxidised. Electrons carried by NAD release 30 ATP, and 4 ATP by those carried by FAD = 34 ATP