1.2 Gas exchange and respiration (Diffusion)

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Slide 1: Video
BiologyMiddelbare schoolvwoLeerjaar 2

This lesson contains 20 slides, with interactive quizzes, text slides and 3 videos.

time-iconLesson duration is: 50 min

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Slide 1 - Video

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Ch. 1 Breath in ... and out




Materials 
- iPad
- Pen, pencil
- note book


For a mark
- No


Lessonup
- Yes
Bags
in bag closet
Phones 
in your bag /
in bag closet 

Slide 2 - Slide

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today''s program 
results 2-test 
revision homework
diffusion
homework


    Slide 3 - Slide

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    Learning objectives: 'what I am going to learn?'
    I can .... 
    • explain what air is.
    • explain the difference between breathing, gas exchange and cellular respiration 
    • explain the relation between photosynthesis and cellular respiration



    New key terms:
    inhalation - exhalation - lung ventilation - gas exchange - 
    cellular respiration 
    previous lesson

    Slide 4 - Slide

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    Air is a mixture of gasses 
    breathing = lung ventilation = inhalation + exhalation
    so your body takes 4% oxygen and gets rid of 3,96% of CO2 and a lot of water ... why? Read a again the introduction of par. 1.1.

    Slide 5 - Slide

    so 21- 17 = 4% O2 is used in the body
    so 4-0,04=3,96% CO2 is waste from the body
    a lot of water is exhaled!

    Why?
    breathing (a.k.a. respiration) vs gas exchange vs cellular respiration
    1. breathing/respiration/lung ventilation: 
    • inhalation & exhalation; moving air through the respiratory tract
    2. gas exchange 
    • exchange of gasses from alveoli (external)  to lung capillaries  (internal) and vice versa , or between capillary and body cell, by a process called diffusion
    3. cellular respiration: 
    • the process by which your cells make energy (and carbon dioxide and water vapour) from glucose, with the help of oxygen

    Slide 6 - Slide

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    Slide 7 - Slide

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    cellular respiration:

    glucose + 1 -> 2 + water vapour + E
    A
    1=carbon dioxide 2= oxygen
    B
    1= oxygen 2= carbon dioxide

    Slide 8 - Quiz

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    When do your body cells respire the most?
    A
    when you run
    B
    when you've had your dinner
    C
    when you are asleep
    D
    when you just have woken up

    Slide 9 - Quiz

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    when do your muscle cells respire the most?
    A
    playing basketball during PE hour
    B
    doing a practical during biology

    Slide 10 - Quiz

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    You are shivering because the temperature in your room is 15C.
    - how does your body react?
    A
    more cellular respiration
    B
    less cellular respiration

    Slide 11 - Quiz

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    Learning objectives: 'what I am going to learn?'
    I can .... 
    • explain what diffusion is and give an example
    • explain the difference between gas exchange and diffusion
    • describe how gasses travel from the lungs to body cells 
    • compare diffusion of gasses and diffusion of water (osmosis)



    New key terms:
    diffusion, osmosis 

    Slide 12 - Slide

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    how does gas exchange take place? 


    mechanism : diffusion 

    between  alveoli  and lung capillaries
    between capillaries and body cells 

    Slide 13 - Slide

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    assignment
    • read button F and G in Brick's Biology 
    • copy the definition of DIFFUSION in your note book
    • do exercises 2, 3 and 4
    • read button H and copy the last sentence in your note book and fill in the gaps 

    Slide 14 - Slide

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    Slide 15 - Slide

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    what makes gas exchange between alveoli and lung capillaries so effective? and between 'body' capillaries and body cells?
    • a large amount of alveoli / body cells 
             --> large surface for diffusion
    • a large amount of lung capillaries  / body capillaries
             --> large surface with difference is gas concentration 
    • alveoli, capillaries and body cells  have thin 'walls' (=1 layer of cells) 
            --> short distance for diffusion 


    Slide 16 - Slide

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    Slide 17 - Video

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    what else makes diffusion
    easier in the lungs?

    Slide 18 - Mind map

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    Slide 19 - Video

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    homework
    learn 1.2 diffusion (button A - G)
    read about osmosis (button H and I)
    finish exercises 1-4
    next lesson pratical ... 

    Slide 20 - Slide

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