B3c - respiration Flashcards Preview

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Flashcards in B3c - respiration Deck (11):

Why is respiration important

Respiration produces ATP, which is used as the energy source for many processes in cells


What is the symbol equation for aerobic respiration

C6H12O6 + 6O2 → 6CO2 + 6H2O


How can you measure the rate of respiration(3)

Measuring how quickly oxygen is used up

Measuring the rate at which carbon dioxide is produced

The higher the rate the faster the rate of respiration


What is the formula for the respiratory quotient

= carbon dioxide produced ÷ oxygen used


How can the metabolic rate be estimated(2)

By the rate of oxygen consumption
-since aerobic respiration requires oxygen


Why is the rate of respiration influenced by
changes in temperature and pH

Respiration is controlled by enzymes, which are affected by changes in temperature and pH


Why does anaerobic respiration take place during
hard exercise in addition to aerobic respiration(2)

Muscles do not receive sufficient oxygen for aerobic respiration

Anaerobic respiration does not require oxygen


What is the word equation for anaerobic respiration

Glucose → lactic acid (+energy)


Describe the main disadvantages of anaerobic respiration compared to aerobic respiration(2)

Produces lactic acid which accumulates in muscles causing pain and fatigue

Releases much less energy per glucose molecule than aerobic respiration


Explain fatigue(2)

Hard exercise causes lack of oxygen in cells. forcing the use of anaerobic respiration

The incomplete breakdown of glucose in anaerobic respiration resulting in the build up of lactic acid(oxygen debt)


How is oxygen debt removed during recovery(3)

High heart rate ensures rapid blood flow which allows blood to carry lactic acid away to the liver

High breathing rate replaces oxygen so aerobic respiration can be used
-also enables liver to break down the lactic acid