YR1_T2_LSN6

• Science
• Middelbare school
• havo, vwo
• Leerjaar 1

HAVE READY

• YOUR TEXTBOOK
• YOUR NOTEBOOK
• A PEN/MARKER
• YOUR MACBOOK (JOIN THIS LESSONUP) 

TOPIC 2: Being in the world 

In this topic you will learn about food chains, molecules in food, the digestive system, combustion inside and outside the body.

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TOPIC 2.4: COMBUSTION IN THE BODY

• I know the difference between aerobic and anaerobic respiration 
• I know the chemical formula of both aerobic and anaerobic respiration 
• I know the disadvantages of anaerobic respiration
• I know what fermentation is and can give examples of fermentation in different foods
• I know the chemical formula for fermentation

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TOPIC 2.4: COMBUSTION IN THE BODY

• Combustion
• Aerobic respiration
• Anaerobic respiration
• Oxygen debt
• Fermentation

p.76-81

ENERGY

• Energy is needed for survival and is used for
• Building new cells
  
• Movement
• Heat

• Food webs show sources of energy for different organisms
• Digestion breaks down the food into smaller molecules
• Respiration is the process of getting the energy from these molecules
• Combustion is the process of burning something
• combustion inside the body is respiration!
•  
  

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AEROBIC RESPIRATION

• Aerobic respiration is combustion with oxygen 
• The formula is:

glucose + oxygen → carbon dioxide + water + energy

• Do you remember the chemical formulas for these substances?
  

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FORMULA

ANAEROBIC RESPIRATION

• Anaerobic respiration takes place when your cells don’t have enough oxygen, for example, when you exercise very hard.
• The formula is: 

glucose → lactic acid + energy

• Do you remember the chemical formulas for these substances?   

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FORMULA

ANAEROBIC RESPIRATION

This type of respiration has disadvantages:

• Gives you way less energy
• The lactic acid causes cramps
• You will still breathe hard after exercising, this extra oxygen is needed to break down the lactic acid. This is called oxygen debt

  

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FERMENTATION

• Fermentation is anaerobic respiration that takes place in plants, fungi or bacteria
• The formula is: 

glucose → alcohol + carbon dioxide + energy

This type of respiration is used to make beer

and wine, but also foods like bread, yogurt 

and sauerkraut.

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FORMULA

Hw for the next lesson

• Complete all the exercises of § 2.4.
• Study the words of lessons 1-5 on WRTS.
• Read and highlight the text of §2.5.
• Complete and review your notes.
• Update your summary on Google Classroom.

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