Lesson 1: Respiration and testing

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Chapter 5 (kerboodle) 

Breathing and respiration

Lesson 1: Respiration and Testing (p.62-66)

Why can't we hold our breath for long?

Video: https://www.schooltv.nl/video/proefkonijnen-in-de-klas-hoelang-kun-je-je-adem-inhouden-onder-water/

Some questions: 

• Why is breathing so important?
• What is the function of the lungs? 
• What is the function of the blood? 
• Why is it more difficult to hold your breath when you are moving? 
  

What is the formula of respiration? 

->

Glucose

Oxygen

Energy

Carbon dioxide

Water

Respiration

Getting energy from food 

• Our fuel is glucose
  
• Oxygen is needed to break down glucose (breathing)
  

Because oxygen is needed we call it:

Aerobic respiration 

Using energy

-Muscles

-Transporting chemicals

-Absorbing food

-Sending messages along nerves

-Building cells for growth

-Keeping a constant body temperature

Where is the energy produced? 

I’m a real “powerhouse” 

That’s plain to see


I break down food


And release energy 

Where is the energy produced? 

I’m a real “powerhouse” 

That’s plain to see


I break down food


And release energy 

Mitochondria

Respriration takes place in all cells all the time! 

Carbon dioxide 

• Waste gas made in respiration
  
• becomes toxic if it builds up in cells
  
• we need to get rid of it
  
• More excersize-> faster and deeper we breathe to remove it
  

Testing for carbon dioxide

• Lime water goes cloudy when CO2 is added
  

More carbon dioxide out? 

Rate of respiration 

How fast respiration takes place

 -Rate at which oxygen is used up        

OR

 -Rate at which carbon dioxide is produced

You need to use a Respirometer 

Respirometer

• Soda lime takes up CO2
  
• Removal of oxygen reduces the volume and pressure
• Coloured water moves towards the organisms 

*The distance moved by the fluid is therefore affected only by the oxygen taken up and not by the carbon dioxide given out.

HW for next lesson

-WB page 46

-Paperclip worksheet 1