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PE - Exercise + Physiology > Energy > Flashcards

Flashcards in Energy Deck (14)
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1

Define Energy

The ability or capacity to perform work, and is measured in joules

2

Define Work, and state the formula used to find its value

A transfer of energy as a consequence of a force acting through a distance

Work = Force x Distance

3

Define Power, and state the formula used to find its value

The rate of transfer if energy between one system and another

Power = Energy or Work / Time

4

Describe how the ATP/PC system works

ATP >>> ADP + P(i) + energy
When [ADP] is high, creatine kinase is activiated
CP >>> C + P + energy (exothermic)
This energy is then used to resynthesise ATP (coupled reaction)
ADP + P(i) + energy >>> ATP (endothermic)

5

Explain how glycolysis in both aerobic and anaerobic respiration occurs

Glycogen >>(GPP - activated by low [CP])>> Glucose-6-phosphate
Glucose-6-phosphate >>(PFK)>> Pyruvic acid + 2ATP

Anaerboic = Pyruvic acid >> Lactic acid

Aerobic = Pyruvic acid goes to the kreb cycle

6

What are the three stages of aerobic respiration? And where do these occur?

Glycolysis (Sarcoplasm)
Kreb's Cycle (Matix)
Electron transport chain (Cristae)

7

Explain the process of the kreb cycle

Acetyl coA + Oxaloacetric acid >> Citric acid
This produces CO2 + Hydrogen atoms + 2ATP
Oxaloacetric acid is reformed

8

What occurs in the electron transport chain?

NAD + FAD carry hydrogen as NADH + FADH
The hydrogen is then oxidised to form water
The electrons bounce down the chain and form 34ATP

9

How many ATP are produced if fats are respired?

200

10

What is OBLA?

The onset of rapid blood lactate accumulation

11

What are the thresholds for the 3 different enegy systems?

ATP/PC - up to 12s
Lactic acid - 2-3mins
Aerobic - 3+mins

12

What are the six factors that affect the predominant energy system?

Exercise intensity / duration
Energy system thershold
Oxygen supply / transport
Food fuel that is avalible
Enzyme activation levels
Fitness level

13

Explain the Fast Alactacid component of recovery?

ATP+PC and myoglobin stores are replenished
1-4l of O2 needed
30s for half / 2-3mins for full

14

Explain the Slow Lactacid compnent of recovery?

Lactic acid >> pyruvic acid (kreb cycle)
Lactic acid >> glycogen + glucose
5-8l of O2 needed
15mins for half / 1hour for full