This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about respiration. For more help with IGCSE Biology please visit mrexham.com

1. IGCSE Biology – 4BI0
MAKING SENSE OF
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• Can you remember how respiration releases
energy?
• Can you write out the word equation, and the
balanced symbol equation, for aerobic
respiration?
• Can you write out the word equation for
anaerobic respiration?
• What are the differences between aerobic and
anaerobic respiration?
• Can you describe simple experiments to show
that carbon dioxide and heat are produced by
respiring seeds or other suitable living
organisms? (Separate science only)
1.1 Life Processes - Respiration
Objectives
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1.1 Life Processes - Respiration
Respiration
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• Respiration is a chemical reaction that happens in
all our cells to release energy.
• This can be used for
– Contraction of muscle cells, producing movement
– Active transport of molecules and ions
– Building large molecules, such as proteins
– Cell division
• The reaction also releases some heat which is
used to maintain steady body temperature.

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1.1 Life Processes - Respiration
Respiration
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• Your cells can carry out two types of
respiration.
• One with oxygen which is called aerobic
respiration and one without oxygen called
anaerobic respiration.

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1.1 Life Processes - Respiration
Aerobic Respiration
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1.1 Life Processes - Respiration
Aerobic Respiration
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1.1 Life Processes - Respiration
Aerobic Respiration
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1.1 Life Processes - Respiration
Anaerobic Respiration
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• Respiration without oxygen.
• We shall look at examples in two types of cell.

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1.1 Life Processes - Respiration
Anaerobic Respiration
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• Respiration without oxygen.
• We shall look at examples in two types of cell.

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1.1 Life Processes - Respiration
Anaerobic Respiration
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• Respiration without oxygen.
• We shall look at examples in two types of cell.

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1.1 Life Processes - Respiration
Anaerobic Respiration
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• Also known as FERMENTATION.
• Yeast cells are single celled fungi.
• Used for commercial purposes such as
brewing.
YEAST

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1.1 Life Processes - Respiration
Anaerobic Respiration
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YEAST
• Also known as FERMENTATION.
• Yeast cells are single celled fungi.
• Used for commercial purposes such as
brewing.
Glucose Ethanol + Carbon Dioxide (+ some energy)

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1.1 Life Processes - Respiration
Anaerobic Respiration
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MUSCLE
• Occurs when the blood cannot reach the
muscles fast enough to supply them with
the required oxygen.

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1.1 Life Processes - Respiration
Anaerobic Respiration
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MUSCLE
• Occurs when the blood cannot reach the
muscles fast enough to supply them with
the required oxygen.
Glucose Lactic Acid (+ some energy)

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1.1 Life Processes - Respiration
Anaerobic Respiration
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MUSCLE
• Anaerobic respiration provides enough energy to
keep the muscles working for a short time.
• However lactic acid builds up in the blood which
causes cramps.
• The lactic acid has to be broken down using
oxygen.
• The volume of oxygen needed to completely
oxidise the lactic acid that builds up in the body
during anaerobic respiration is called oxygen
debt

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1.1 Life Processes - Respiration
Aerobic or Anaerobic Respiration
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1.1 Life Processes - Respiration
Respiration experiments
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1.1 Life Processes - Respiration
Respiration experiments
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