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Respiration – Revision Pack (B3) Aerobic Respiration: The symbol equation for aerobic respiration: C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O Glucose + oxygen → carbon dioxide + water Measuring Respiration Rate: Two different experiments can be used to measure rate of respiration. These two ways involve: - Measuring how much oxygen is used up (the faster it’s consumed, the faster the respiration rate - The rate at which carbon dioxide is made The rate of oxygen consumption can be used as an estimate of metabolic rate because aerobic respiration requires oxygen using the respiratory quotient (RQ) formula: RQ = carbon dioxide produced / oxygen used The rate of respiration is influenced by changes in temperature and pH. This is because enzymes are involved in respiration, and their activity varies with temperature and pH. Anaerobic Respiration: Muscles often don’t receive sufficient oxygen during exercise. They start to use anaerobic respiration as well as aerobic respiration. The word equation is: Glucose Lactic Acid (+ energy) Anaerobic respiration makes lactic acid which builds up in muscles. This can cause extreme pain and fatigue (tiredness). It also released much less energy per glucose molecule than aerobic respiration. Oxygen debt is when the incomplete breakdown of glucose results in the build up of lactic acid. Sometimes during recovery the heart rate and breathing rate stay high; this is because: - Rapid blood flow allows the lactic acid to be carried away to the liver - Extra oxygen can be supplied, enabling the liver to break down the lactic acid

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Transcript of intranet.friaryschool.comintranet.friaryschool.com/Intranet/depts/science/End of year tests... ·...

Page 1: intranet.friaryschool.comintranet.friaryschool.com/Intranet/depts/science/End of year tests... · Web viewThe word equation is: Glucose . Lactic Acid (+ energy) Anaerobic respiration

Respiration – Revision Pack (B3)

Aerobic Respiration:The symbol equation for aerobic respiration:

C6H12O6 + 6O2→ 6CO2 + 6H2OGlucose + oxygen → carbon dioxide + water

Measuring Respiration Rate:Two different experiments can be used to measure rate of respiration. These two ways involve:

- Measuring how much oxygen is used up (the faster it’s consumed, the faster the respiration rate

- The rate at which carbon dioxide is madeThe rate of oxygen consumption can be used as an estimate of metabolic rate because aerobic respiration requires oxygen using the respiratory quotient (RQ) formula:

RQ = carbon dioxide produced / oxygen used

The rate of respiration is influenced by changes in temperature and pH. This is because enzymes are involved in respiration, and their activity varies with temperature and pH.Anaerobic Respiration:Muscles often don’t receive sufficient oxygen during exercise. They start to use anaerobic respiration as well as aerobic respiration. The word equation is:

Glucose Lactic Acid (+ energy)

Anaerobic respiration makes lactic acid which builds up in muscles. This can cause extreme pain and fatigue (tiredness). It also released much less energy per glucose molecule than aerobic respiration. Oxygen debt is when the incomplete breakdown of glucose results in the build up of lactic acid. Sometimes during recovery the heart rate and breathing rate stay high; this is because:

- Rapid blood flow allows the lactic acid to be carried away to the liver- Extra oxygen can be supplied, enabling the liver to break down the lactic

acid

ATP:ATP is a substance that is used as the energy source for many processes in cells. ATP is produced as a result of respiration. For example, one glucose molecule can release enough energy during respiration for the production of:

- 38 ATP molecules by aerobic respiration