Breathe in... and out - pargraph 1 and 2

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Chapter 1 Breathe in ... and out

today''s program 

Introduction to chapter 1: Breathe in... and out

Paragraph 1: The respiratory system

Learning objectives: 'what I am going to learn?'

I can .... 

• describe the path that air takes when you breathe / respire
• explain why it is better to breathe through your nose
• explain why it is better not to talk while you eat 

New key terms:

Nasal cavity - oral cavity - pharynx - larynx - windpipe

bronchus - bronchi - bronchioles - alveoli - nasal lining -

diaphragm - ciliated cells - olfactory cells - epiglottis - uvula - vocal cord

Uvula and epiglottis while breathing and swallowing

STUDY paragraph 1.1: The respiratory System
DO exercise 1 up to 3 and 5 up to 8 (so skip 4)

today''s program 

Chapter 1: Breathe in... and out

Discuss homework paragraph 1

DO exercise 4 DEMO

Paragraph 2: Gas exchange and 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 

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?

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 vs cellular respiration

combustion vs cellular respiration 

combustion:  fuel + oxygen -> carbon dioxide + water + energy 

fuel :  candle, paper, alcohol, etc. 

energy: heat, light

cellular respiration = combustion is body cells 

fuel : glucose

energy: heat, ATP

why do organisms need cellular respiration? 

- to move

- to keep 37C body temperature 

Recap

cellular respiration:

glucose + 1 -> 2 + water vapour + E

1. 1=carbon dioxide 2= oxygen
2. 1= oxygen 2= carbon dioxide

When do your body cells respire the most?

1. when you run
2. when you've had your dinner
3. when you are asleep
4. when you just have woken up

when do your muscle cells respire the most?

1. playing basketball during PE hour
2. doing a practical during biology

You are shivering because the temperature in your room is 15C.
- how does your body react?

1. more cellular respiration
2. less cellular respiration

STUDY par. 1.2 Gas exchange and respiration
DO exercise 1 up to and including 7