1.2 Gas exchange and respiration (Cellular respiration)

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 
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Slide 1: Slide
BiologyMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 13 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 30 min

Items in this lesson

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 

Slide 1 - 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 2 - 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
external
    outside the body
internal: 
-   inside your body -   in or in between         your cells 

Slide 3 - Slide

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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 (par. 1.3) 
  • 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 4 - Slide

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combustion vs cellular respiration 
combustion:  fuel + oxygen -> carbon dioxide + water + energy 
fuel :  candle, paper, alcohol, gasoline, etc. 
energy: heat, light, locomotion

cellular respiration = combustion is body cells 
fuel : glucose
energy: heat, ATP 

Slide 5 - Slide

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why do organisms need cellular respiration? the energy is needed for  
- to move (muscle contractions) 
- to keep 37C body temperature 
- to grow or to repair or replace damaged cells 

Slide 6 - 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 7 - 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 8 - 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 9 - 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 10 - Quiz

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Slide 11 - Slide

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Slide 12 - Slide

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huiswerk
par. 1.2 
summarize What is air & cellular respiration
do exercise 1, 10 and 11

Slide 13 - Slide

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