YR1_T2_LSN8

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

Get ready

• Your Macbook (join the LessonUp lesson)
• Your notebook.
• Your textbook.
• Pen & highlighter

Topic 2 Lesson 8

Plan for today

• Planning upcoming lessons
• Explanation T2.4 Combustion in the body
• Work on homework

Planning upcoming lessons

• Next week:                           Theory 2.5 
• Week after:                           Recap Topic 2 + Glossary test
• Week after that week:     Test Topic 2 

T2.4 Combustion in the body

Learning goals

• 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

Key words

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

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

Aerobic respiration

Aerobic respiration is combustion with oxygen 

The formula is:

 glucose + oxygen → carbon dioxide + water + energy

Formulas?

Aerobic respiration

Aerobic respiration is combustion with oxygen 

The formula is:

 glucose + oxygen → carbon dioxide + water + energy

Does the formula looks familiar? It is the opposite of photosynthesis!

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

Anaerobic respiration 

Anaerobic 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

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.

Homework

Make question 33-42 in your textbook (pages 78-81)