1.2 Cellular respiration-2 (Diffusion)

• Biology
• Middelbare school
• vwo
• Leerjaar 2

0

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 

today''s program 

results 2-test 

revision homework

diffusion

homework

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

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 

process -                        place

respiration -                   in and out nasal and oral cavity

lung ventilation -           between windpipe and lungs

gas exchange -              between alveolus and lung capillary

                                      between capillary and body cell

how does gas exchange take place? 

mechanism : diffusion 

between  alveoli  and lung capillaries

between capillaries and body cells 

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 

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 

what else makes diffusion
easier in the lungs?

homework

learn 1.2 diffusion (button A - G)

read about osmosis (button H and I)

finish exercises 1-4

next lesson pratical ...