Lecture 1: Energy Systems Flashcards
What is energy?
How does it manifest in the body?
Property of matter and radiation which manifests as a capacity to perform work.
Movement, cell function, maintenance of life.
Do we need energy to hydrolyse ATP - ADP or do we need energy to phosphorylate ADP - ATP?
The re-Phosphorlyation, (re attachment of a phosphate molecule) is when we need energy. ADP - ATP.
The hydrolysis of ATP-ADP produces enery.
What happens when we add H20 to ATP?
Produces ADP, Hydrogen ion, inorganic phosphate and 31kJ of energy. This reaction is only 30% efficient. Heat which is a biproduct accounts for the rest.
What is Myofibrilar ATPase?
Enzyme which catalyses this reaction. The hydrolysis of ATP - ADP.
Located at the head of the myosin molecule
In terms of muscular contraction, when do we need energy during cross bridge cycling?
ATP is required to release the actin from the myosin.
What is the sole aim of all the energy systems?
Re-Phosphorlyise ADP to ATP.
How is ATP Resynthesise achieved through the ATPPC system?
PCr+ADP+H = ATP+Cr
How does this Lactic Acid system Resynthesise ATP?
Glucose+2ADP+2Pi - 2ATP+2H20+2lactate
How is ATP resynthesised via the Aerobic pathway?
Substrate + ADP + O2 = ATP + CO2
Explain the energy yield of the LA system?
Glycolysis converts glucose to pyruvate.
Gycolysis requires an input of 2 ATP, however the yield is an output of 4 ATP.
Balance is a gain of 2 ATP per molecule of glucose converted to pyruvate.
What determines the fate of pyruvate?
The presence of oxygen.
With oxygen = AcetlyCoA to then enter the Krebbs cycle
No oxygen = Lactate
What is the actual ATP yield of glucose?
Conflicting information about how much ATP is produced.
29.85 ATP/Glucose molecule
What is the name of the process by which Free fatty acids are turned in to energy?
Beta oxidation
