Energy systems

Question 1

What is energy?

Answer 1

The property of matter and radiation which manifests as a capacity to perform work (such as causing motion or the interaction of molecules)

Question 2

How does energy manifest in the human body?

Answer 2

Movement
Cell function
Maintenance of life

Question 3

What is the function of myofibrilar ATPase?

Answer 3

Enzyme that catalyses the hydrolysation of ATP to ADP.

Located in the myosin head.

Question 4

Name the 3 energy systems

Answer 4

Anaerobic Pathway:

1) ATP/ PC System (Phosphagen)
2) Glycolytic (Lactic Acid)

Aerobic Pathway:
3) Mitochondrial respiration

Question 5

Please explain the energy yield of the LA system?

Answer 5

Glycolysis converts glucose to pyruvate.

Requires an input of 2 ATP, however the yield is an output of 4 ATP.

Balance is a gain of 2 ATP per glucose molecule converted to pyruvate.

Question 6

Actual ATP yield

Answer 6

29.85 ATP/glucose

Question 7

Please describe the aerobic power, fat and CHO figure.

Answer 7

Association between exercise intensity and fuel utilisation.

At rest, most energy come from fat with minimal contributions of CHO

With increasing intensity CHO utilisation increases and fat reduces

Training and SNS stimulation may affect substrate utilisation.